Tomos comparator holder
thingiverse
This is comparator gauge holder for Tomos APN or UMO engines, used for ignition timing setup procedure. It can be used on other engine types if space around spark plug hole allows it. This holder should be mounted instead of spark plug always on COLD engine, as it could melt down. Please do not tight it too hard as it could broke. I have used PETG, but other materials could be used. Here you can find two holders: 8mm comparator leg diameter (8,3 mm hole diameter) 9mm comparator leg diameter (9,3 mm hole diameter) Anyway, if you have problem with fitting your comparator in the hole-you can grind it to fit it perfect :-)
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