A little sketch I made of the basic variable speed system the manufacturers are using nowadays.  It's not to scale or anything, but just outlines the basic principle, and how it works.

[6 Pack] 138 LED Security Lights Motion Sensor with 3 Lighting Modes, Solar Powered Lights Waterproof Wall Lights Outdoor for Fence Garden Yard Garage #ad https://amzn.to/4cJVKyd


About this item

• 【6 Pack 138 LED Solar Lights】Outdoor solar wall lights equipped with 6 pack 138 super bright LEDs, each a 1200mAh rechargeable battery, 180º wide angle lighting. Outdoor solar lights can providing a super bright illuminance for a wide area.
• 【Outdoor Wall Lights with 3 Intelligent Modes】Solar motion sensor lights outdoor bring 3 lighting modes 1. Medium Light Mode(the light turns on automatically night and stay all night.) 2. Dim light sensor mode (the solar security lights stays all night and turns brighter when it detects motion) 3.Sensor lights mode (when it detects motion at night, Motion sensor turns the light on and off automatically).Meet your different demands.
• 【Solar Powered & Energy-Saving】Solar lights outdoor convert solar energy into electricity through daily exposure to sunlight, which is energy saving & eco-friendly, greatly reduces carbon emission. Upgraded solar panel has a high conversion up to 20%, more efficient conversion than other solar lights.
• 【IP65 Weather Solar Powered Security Light】Made of high quality and durable ABS materials, the solar lights outdoor garden are heat resistant and IP65 waterproof, it can withstand all kinds of severe weather. Perfect for outdoor use such as fence, deck, stairs, exterior wall. Which creates a bright and safe environment for you and your family.
• 【Easy Installation】Solar wall lights are compact and easy to install. No need cables, just use the provided screws and plugs. If you don't want to punch a hole, you can place it with double-sided tape. The ideal installation height is approximately 2 to 3 meters. Please install the solar lights in the direction of sunlight to get a better charge.

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About this item
Featuring silverlite Elite hand pump
For testing and Diagnostics of vacuum engine systems
For testing and Diagnostics of pressure related engine systems

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Yooreal Digital Tachometer, RPM Gauge Meter With Clip for Push Lawn Mower Car Generator Compressor Chainsaw Snowmobile Motorcycle ATV Truck #ad https://amzn.to/4cJe7U3


About this item

• 【ALLIGATOR CLIP INSTALLATION】: New way for connecting spark plugs, fast and easy, firmly installed on the small gasoline engine, user-friendly design.
• 【RPM GAUGE METER】: Record the real-time RPM and maximum RPM ,range:0-25000RPM, and the max RPM can be reset.
• 【SELECTABLE FIRING PATTERNS】:Suitable for 2 stroke1 cylinder/2 stroke2 cylinder/2 stroke3 cylinder/4 stroke 1 cylinder/4 stroke 2 cylinder/4 stroke 3 cylinder/4 stroke 4 cylinder/4 stroke 5 cylinder/4 stroke 6 cylinder/4 stroke 8 cylinder/4 stroke 12 cylinder/4 stroke 16 cylinder gas engine.
• 【Favorable Waterproof】: Display with PC transparent board and 100% epoxy resin sealing craft can keep it away from the damp or moist, which also prevent the strong shock between transport or cleaning.
• 【Others】：Built-in battery CR2450 with long endurance; 2 years after-sales and technical group support.

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Miracle-Gro PEAT FREE Premium All Purpose Compost, 50 Litres #ad https://amzn.to/3U4ZOSo

About this item

• Outperforms ordinary peat free compost
• Contains coir – an organic component that provides a near perfect pH balance and absorbs more water
• Fibre Smart provides the optimum balance of air and water for strong root growth
• Smart Release feeding for up to 3 months
• Unique combination of 14 vital minerals, N, P, K and trace elements, vital for maintaining plant health

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Ratchet Crimping Plier, Preciva Insulated Ratcheting Wire Terminal Crimping Tool, AWG20-10 (0.5-1.5mm²) (1.5-2.5mm²) (4-6mm²), Electrical Crimper Plier for Electrical Connectors #ad https://amzn.to/4cAN4dz

About this item

• [Made of Carefully Selected Materials]----Preciva wire crimping tool is made of hardened quality alloy steel, strong and durable.
• [Self Locking Device]---- Forced locking, high crimping quality. Exquisite process and refined jaw make the crimping effect more perfect, smooth and firm.
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• [Grip Design]---- Not only effectively prevent sliding, but also reduce hand fatigue during work.
• [Widely Adopted]---- Preciva ratcheting insulated wire terminal crimper are widely used in various electrical circuit maintenance, workshops, auto repair electricians, machinery or automobiles,etc. Include: 1*ratcheting wire crimper tool, 1* user manual.

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[4 Pack] 140LED Solar Security Lights Outdoor, Litogo Solar Motion Sensor Lights 270ºWide Angle Waterproof Solar Powered Durable Wall Lights Outside 3 Modes for Garden Fence Door Yard Garage Pathway. #ad https://amzn.to/3VCbtJy

About this item

• 🌞【3 Intelligent Lighting Modes】We recommend you use MODE 3 (Sensor light mode). The light is off when there is no movement, full brightness when motion is detected. It will be more energy-saving and environmentally friendly, the life of the lights can be extended by about 50%. MODE 1 (Constant light mode) : auto power on at night, auto power off during the day. MODE 2 (Dim light sensor mode): Dim light when there is no movement, full brightness when motion is detected.
• 🌞【4 Pack Solar Fence Lights 】The Solar panel convert solar energy into electricity through daily exposure to sunlight. Equipped with a 1200mAh large-capacity rechargeable battery, brightness is up to 800 lum, it can illuminate your house more than 8 hours working time at dark night.
• 🌞【IP65 Weather-Resistant】Solar wall lights are made of high quality and durable ABS materials, which can effectively isolate water and work normally even in harsh weather. Powered by solar, better for environment and help you save a lot of money on electricity.
• 🌞【Easy and Quick Install 】Simple design, come with screws and user guider. You can finish this little solar lights' installation in a few minutes.
• 🌞【What You Get】 ① 4 pack *140LED Solar Lamp & 1 *User Manual & 4* Screws; ② 60 Days Money-Back Guarantee, 12 Months Worry-free Warranty, 24 hours Friendly Customer Service.

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Grow Your Own Seed Box by Garden Pack - 75 Varieties of Flower, Herb, Vegetable Seeds - Gardening Gifts for Women and Men #ad https://amzn.to/4aCiIoX

About this item

• COMPLETE GROWING KIT: The ideal starter kit for the budding gardener. Perfect for crafts for adults and kids' activities! Along with a huge range of vegetable seeds, your grow kit comes with gardening gloves and detailed growing instructions. It's all you need to get growing.
• NON-GMO & HIGH GERMINATION: Thanks to our rigorous quality control and germination lab testing, our premium seed collection will not disappoint. Our seeds are double quality checked and non-GMO. You can rest assured that what you sow in your vegetable, flower and herb garden will grow!
• BIG VALUE KIT: With 55 different vegetable plants, 15 types of herb plants and 5 varieties of flowers, you'll receive over 50,000 seeds in total! With such a wide range of seeds for planting vegetables and fruits and flowers, you'll get to enjoy a complete market garden, all from one box.
• GARDENING GIFTS SET: Packaged in a deluxe wooden box and with premium gardening accessories, it makes an ideal gift idea for a budding gardener. Perfect diy kits for adults and little ones that are ideal for a green fingered friend, a house warming gift, or even Christmas presents.
• EASY TO GROW: With detailed planting, sowing, harvesting and seasonal e-book, growing your own outdoor and/or indoor garden has never been simpler! Even complete beginners and children can enjoy success from this straightforward seed growing kit.

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Amazon Spring Deal 20-25 March

Draper 44 Piece Screwdriver Hex key & Bit Set with Stand - 81294 - Soft Grip Screwdrivers Tools with Hex keys #ad https://amzn.to/3PsCjQk

About this item

• Ergonomic soft grip handle for optimum grip and torque
• All screwdrivers sandblasted to provide the user with extra grip
• Contents Include 6 x Plain Slot Screwdrivers: 3 x 75 mm (x2), 5 x 75 mm, 5 x 100 mm, 6 x 100 mm, 8 x 150 mm, 4 x Cross slot screwdrivers: No.0 x 75 mm, No.1 x 75 mm, No.1 x 100 mm, No.2 x 100 mm, 4 x PZ TYPE screwdrivers: No.0 x 75, No.1 x 100, No.2 x 100, No.3 x 150 mm, 3 x Draper TX - STAR screwdrivers: T8 x 100, T10 x 100, T15 x 100 1 x 1/4 Inch bit driver, 3 x Plain slot bits: 5, 6, 7 mm, 3 x PZ type bits: No.1, No.2, No.3, 4 x Draper TX - STAR bits: T7, T8, T9, T10, 8 x Metric hex keys: 1.5, 2, 2.5, 3, 4, 5, 5.5, 6 mm and 8 x Imperial hex keys: 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4 Inch

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Amazon Spring Deal 20-25 March.

Blink Outdoor HD security camera (1-Camera System), Works with Alexa + All-new Echo Show 5 (3rd generation) | Charcoal - Smart Home Starter Kit #ad https://amzn.to/3TLcLRh

• This bundle includes 1 of Blink Outdoor HD security camera (1-Camera System) and 1 of Echo Show 5 (3rd Gen)- everything you need to start your smart home.
• Blink Outdoor is a wire-free battery-powered HD security camera that helps you monitor your home day or night with infrared night vision.
• With long-lasting battery life, Blink Outdoor runs for up to two years on two AA lithium batteries (included).
• Blink Outdoor is built to withstand the elements to help you protect your home indoors or out, come rain or shine.
• Get motion detection alerts on your phone with the option to customise motion zones in the Blink Home Monitor app so you're only alerted when you need to be.
• See, hear and speak to visitors with Live View in real time and two-way audio features on your Blink Home Monitor app (live view is not continuous).
• Designed so you can set it up yourself in minutes. No wiring or professional installation required.

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Blink Video Doorbell + Sync Module 2 | Two-way audio, HD video, motion and chime app alerts, easy setup, Alexa enabled, Blink Subscription Plan Free Trial — Wired or Wireless (White) #ad https://amzn.to/3Pw7gn0

• Answer your door any time and anywhere from your smartphone with 1080p HD day and infrared night video, and two-way audio.
• Experience up to two years of powerful battery life, customised alerts, privacy settings and more.
• Choose to save and share clips in the cloud with a free 30-day trial of the Blink Subscription Plan or locally with the Sync Module 2 and USB drive (sold separately).
• Designed for every home, go wire free or connect to existing doorbell wiring to also sound your current in-home bell. Without wiring, you can use your Blink Mini camera (sold separately) as an indoor plug-in chime.
• Set it up yourself within minutes, with the two included AA lithium batteries, and then connect to Wi-Fi using the app. The newly designed internal battery seal provides IP54 weather resistance rating.
• Works with Alexa—access live view, two-way audio, receive motion and chime alerts, arm and disarm your doorbell, and more.
• Includes: a Blink Video Doorbell, a Sync Module 2 and mounting kit (including corner mount, screws and fixings).

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Yooreal Digital Tachometer,RPM Gauge Meter With Clip for Push Lawn Mower Car Generator Compressor Chainsaw Snowmobile Motorcycle ATV Truck #ad https://amzn.to/49Vg2mA

About this item

• 【ALLIGATOR CLIP INSTALLATION】: New way for connecting spark plugs, fast and easy, firmly installed on the small gasoline engine, user-friendly design.
• 【RPM GAUGE METER】: Record the real-time RPM and maximum RPM ,range:0-25000RPM, and the max RPM can be reset.
• 【SELECTABLE FIRING PATTERNS】:Suitable for 2 stroke1 cylinder/2 stroke2 cylinder/2 stroke3 cylinder/4 stroke 1 cylinder/4 stroke 2 cylinder/4 stroke 3 cylinder/4 stroke 4 cylinder/4 stroke 5 cylinder/4 stroke 6 cylinder/4 stroke 8 cylinder/4 stroke 12 cylinder/4 stroke 16 cylinder gas engine.
• 【Favorable Waterproof】: Display with PC transparent board and 100% epoxy resin sealing craft can keep it away from the damp or moist, which also prevent the strong shock between transport or cleaning.
• 【Others】：Built-in battery CR2450 with long endurance; 2 years after-sales and technical group support.

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NInE-ROnG Digital Tach Hour Maintenance Meter with Backlight Built-in Battery Waterproof Programmable Engine Firing Patterns use for Lawn Mower Motorcycle Outboard Motor Generator Snow Blower #ad https://amzn.to/49Szi4e

• 9 Engine Firing Patterns----Programmable engine firing patterns for a wide range of engine types, select the right ignition mode to obtain more accurate RPM.
• Hour Meter（TOT&JOB)----Track the total number of hours and partial hours of engine operation, TOT&JOB range: 0-999999H, timing accuracy: 1M/0.1H/1H. TOT cannot be reset, but the initial TOT time can be set when the engine has been in operation for no more than 1H.
• Tachometer(RPM&MAX RPM&ALERT RPM)----Displays the current and maximum RPM of the engine running, range: 0-25000RPM, accuracy: 10RPM; Alert RPM can be set, range: 100-25000RPM/can off, warning icon and red backlight will appear when the set value is exceeded.
• Maintenance Meter(SVC)----Settable engine maintenance interval time, timing is countdown;SVC range: 1MIN-9999H59MIN/can off. Red backlight and icon flashes as a reminder when maintenance time is reached.
• Others----3 backlight options: "L-Auto" "L-ON" "L-OFF",(backlight colors: white/ red); Low battery reminder function; Records the number of engine starts; LCD goes into standby after 1 minute of no operation on the hour meter.

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Stihl Tachometer RPM Indicator EDT 9 #ad https://amzn.to/4a8nT0p

• About this item

• STIHL Tachometer
• Speed indicator EDT 9
• Measuring device, sensor cable short 15 cm, clamping cable long 60 cm with clamp (for ignition cable or spark plug plug)
• Suitable for small engines with 2 or 4 stroke engines
• Tool for determining the exact engine speed

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Here's a comparison between the old and new type friction disc systems fitted to many of the Hayter mowers such as Harriers etc.  The friction disc system hasn't changed much over the years other than now it's a two piece affair rather than one piece. The blade is driven by the outer edges of the disc only and would actually spin freely on the centre distance piece or spacer if it wasn't being bent and pushed against the edges of the disc.

Advantages: With the two piece is it's easier to remove, you no longer have to get the whole thing to slide off the crankshaft, which can often be rusted on solid if not properly maintained,.

Disadvantages: I can fall off when removing the blade. Some customers struggle to refit it correctly on its drive pegs, thus resulting in a bent disc which then wobbles on the hub causing vibration and noise.

Here's a diagram of the two types, (Note: these are not to scale). Just for those who don't know how it works.

Seen these questions asked a few times on social media, such as, how does the belt run on a old Hayter Harrier 305, 306,307 etc.  So I've made a couple of diagrams that might be of use.  They are not to exact scale but you should get the idea. 

The belt Run.



The Belt Idler arm.

A lot of people seem to be unsure about where and how the arm return spring fits, so this diagram should help with that. 

VORXEON 13Pcs Star Bit Socket Set T8-T70, 50BV30 CR-V Drive Socket and S2 Alloy Steel Bit with Storage Case, 3 Sizes 1/4 3/8 1/2 Inch. #ad https://amzn.to/3IknEmj

About this item

• 👍� 【What you get】VORXEON 13Pcs star bit socket set includes 1/4 inch drive: T8, T10, T15, T20, T25, T27, T30; 3/8 inch drive: T40, T45, T50, T55, T60; 1/2 inch drive: T70, 1 tool storage case. Tool case is easy to carry, star head socket set are neatly arranged and marked with specifications for easy access, making your work easy and practical.
• 👍�【Upgraded Material】The star socket set is made of high quality heat-treated 50BV30 inscribed vanadium alloy steel, which contains boron elements with wear and rust resistance and provides more torque than the common CR-V on the market. The bit of socket is made of heat-treated S2 alloy steel, which is extremely hard, durable and long-lasting.
• 👍�【Wear and Rust Resistant】VORXEON 13Pcs star bit socket set are fully polished to provide superb rust resistance. Chrome-plated mirror socket and zinc phosphate bit treatment make star bit socket set beautiful, smooth and burr-free and rust-free.
• 👍�【Precise Tightening】The star bit socket set fits perfectly with universal wrenches, fits tightly and precisely into any torque wrench or impact driver, is smooth and fluid to use, and saves a lot of effort.
• 👍�【Widely Used】VORXEON star head socket set are the perfect automotive hand repair tool set. It can help you repair cars, machinery, motorcycles, bicycles, appliance repair, home improvement, construction, carpentry, etc. Perfect for professionals or DIY enthusiasts.

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LSLANSOON 3/8'' Drive Impact Bolt Nut Extractor Set, 13 Pcs Lug Nut Remover Kit 1/4''-3/4'' Twist Socket Tool Set with a 1/4'' Hex Drive to 3/8'' Socket Adapter. #ad https://amzn.to/4bSIIy5

About this item

• 【High Quality Material】Made of high strength Cr-Mo steel with high hardness, these lug nut removal sockets are more sturdy and durable.
• 【Bolt Extractor Socket Set】This is 14 pieces nut remover set that can be used with 3/8" square drive wrench, ratchet, or breaker bar for removing damaged, frozen, rusted, rounded-off bolts, nuts & screws.
• 【Compatibility】Standard 3/8-inch drive and 1/4-inch hex drive to 3/8-inch drive adapter to let the extractors compatible with common or heavy-duty power tools, drivers and screwdrivers handle tools.
• 【Spiral Design】The 6-point spiral socket design allows a secure connection to the rounded-off fastener to be extracted.
• 【Application】These Locking Wheel Lug Nut Removal Tools fit hex heads sized 6.35mm(1/4"), 8mm(5/16"), 9.5mm(3/8"), 10mm, 11mm(7/16"), 12mm, 12.7mm(1/2"), 13mm, 14mm(9/16"), 16mm(5/8"), 17mm, 17.5mm(11/16"), 19mm(3/4") to quickly replace rusting, rounded, or stripped lug nuts and bolts.

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Auto Test Light, Mechanic Tools Auto Car Truck Voltage Auto Circuit Electrical Tester 6V 12V 24V DC Circuit Test Probe with Indicator Bulb and 96cm Wire Long Vehicle Volt Circuit Test Probe Pen. #ad https://amzn.to/49zi6k8

About this item

• 【Premium AS and Carbon Steel Material】The handle of this auto car truck voltage circuit tester is made of high quality AS material, super hard and sturdy, won't easy get broken, anti electricity and high heat resistance, safe to use; the probe is made of hardened & tempered chrome plated carbon steel, anti rust and very sharp, can easily pierces wire insulation to check circuitry; high quality for long and easy use
• 【Premium AS and Carbon Steel Material】The handle of this auto car truck voltage circuit tester is made of high quality AS material, super hard and sturdy, won't easy get broken, anti electricity and high heat resistance, safe to use; the probe is made of hardened & tempered chrome plated carbon steel, anti rust and very sharp, can easily pierces wire insulation to check circuitry; high quality for long and easy use
• 【Compact Design for Convenient Use】This circuit test probe is about 17.8cm long, and the probe of it is about 8.5 cm, exact length for convenient test and also easy to carry for convenient use, the wire can be easily tided to store when you are not using it
• 【Wide Usage for Volt Between 6-24V】The test range of this vehicle volt circuit test probe pen is from 6V to 24V, the most common voltage range of vehicles in the market, can help test cars motorcycles trunks or any other electric device within the range,and there is a long 96 cm wire to help you to probe the devices that hard to reach; quite practical to use

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STIHL MS171 - MS181 Not Oiling?

The usual and most common cause of this issue on these models is the oil hose.  It might look ok even when you remove it from the saw, but I can almost guarantee replacing the hose will cure the non oiling issue. Seen people change oil pumps and worm drives and to be honest it's rarely necessary. 

Symptoms: with the bar and chain removed and running the saw at reasonably high revs, you'll see it spitting and blowing the occasional bubble out of the oil channel.