most of fasteners using threads to engage parts to be join. you cannot create these threads by using simple workbench, especially when you want a small one (micron scale). you need a high resolution machinery to create these threads. you need a high resolution lathe machine, possibly with numerically controlled system
Forge for head, (including dies, punches for the socket)
Heat Treatment
labs - for input material check, Post heat Treatment property check, NDT etc.
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches