Tomos comparator holder

thingiverse

This is a custom gauge holder for Tomos APN or UMO engines, designed specifically for ignition timing setup procedures. It can also be used on other engine types if there's sufficient space around the spark plug hole. To ensure safe installation, mount this holder in place of the spark plug only when the engine is cold, as excessive heat could cause it to melt down. Avoid overtightening the holder, as it may break off. The material I've used is PETG, but other materials can be substituted if needed. Two versions of the holder are available: one with an 8mm comparator leg diameter (8.3mm hole diameter) and another with a 9mm comparator leg diameter (9.3mm hole diameter). If you encounter any issues with fitting your comparator into the hole, consider grinding it to achieve a precise fit.