Need a feeler gauge to adjust the gap. (A wire-type gap gauge is impractical.) One possible improvement would be to change the shape to round so the gauge can be held in a vise. This would make it easier to hold the sensor with your hands and turn the knob.
π ABN Inline Spark Plug Tester β Straight Boot Ignition Test Light for Small Engine Vehicles: Cars, Motorcycles, Lawn Mowers, Chainsaws
9 Review
Hairstyler Dyson Airwrap complete long HS05, bright nickel/bright copper
19 Review
π§ Enhance Performance with the Boost Monkey Spark Plug Gap Tool (12mm & 14mm) + Feeler Gauge
9 Review
π§ Effortless Spark Plug Boot Removal Tool for Mercedes Benz V6 V8 - EWK 17mm Wrench
9 Review