Also, old pinions used to have different teeth pitch, so if using with a modern car then you may find it won't mesh properly.
Can't comment on whether grubs were imperial or metric, but even today many US models still use imperial screws and fittings while Japanese use metric. Presume the pinions are all standard though as they are sized for motor shaft and gear teeth pitch
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I've got Araldite and a Swiss Army Knife - what more do I need?
Yokomo YZ-2
No 4WD because nothing lives up to my original Optima. Until now maybe?...
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