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1. middle holes in bottom? why 9mm at bottom n 10 or 11mm at top? or extra room for vibtation or just cheaper to have less? or just mold release? 2. is case aluminum? n how pure or mix? i thought cases half alumnium n half monkey? or is there a standard? i think bearing shims roller is steel...

got bike for around half a k in parts cleaned up. i didnt take it apart but someone did n stripprd case bolt in pic. i think 8m. would yall drill it out and retap 8m or try to go bigger? is it even exactly neccisary bolt even although i have bit n tap already. plus i was wondering do yall...