TBH id go with Carlin's suggestion. Ive had a couple of pinions where the hole wasnt 100% correct size for the motor shaft *cough* *Annsmann* *cough* *cough* and the fit was cr*p. But I never used these, rather chucked em in the bin to add to the vast amounts of landfill pollution and poddled off and got some better ones (RW are usually bang on!) Or KYOSHO... of course...
