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					Originally Posted by knucklesplitter  Ewww.  M12x1.25 is a rare fine thread.  Rare besides lugnuts I guess.  M12x1.75 is "standard".
 You should measure the hole size with that fancy Harbor Freight digital caliper to be sure what you have (M8 or M10).
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 The hole in the pulley is 10mm.  But I'm not sure if that's what the original bolt was... I think it was smaller than the hole.  If I'm going to have to sleeve the threads, I might as well go back to the original sized bolt.
Course, if I do need an M10, then I'll likely have to bore out the hole bigger for the sleeve anyway, meaning I can tap it for M14xWhatever, or use a press-in insert instead of a threaded one.