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Sept. 18, 2020, 10:23 p.m. -  Sean Chee

This is actually a really good idea. Next time my bike is in a state of disassembly I will make sure I measure the fasteners. I just hopped on mcmaster carr and searched by drive size (4mm hex). Their stocked sizes include m5 , m6 and m8 in all sorts of materials, thread pitch, head shapes, and strengths. Your local industrial fastener supply store is likely to have an even larger range.  Anything unique is probably able to be made up by a local machine shop for the cost of a few beers. I already have 4-10mm hex broaches for my lathe as I make up my own screws to be fastened with an allen key of different size to the standard key that thread size uses.

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