by 4ndy, published
Cheaper than any other wrench if you only want to get a couple of specifically-sized taps made from good steel.
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Nice and simple! Depending on how standardized your tap collection is I have been able to get by with an even simpler design (e.g. http://www.thingiverse.com/thi... or maybe you could whip off a printable equivalent) which I think might be a bit more resistant to wear in the long term(?) - having said that I haven't printed your design here so maybe it's a non-issue...
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---(Ideally you could cast or machine the pinching block out of scrap metal, though the block might not even be necessary)
* Ream out the 8mm hole with a drill bit, or tap it with your bolt itself.
* Insert your bolt or studding.
---(Optional step for studding: drill a hole in it and stick something like a pin in it as a handle - pictured for an idea)
* Use the bolt to drag an M8 nut into the captive nut slot.
* Clamp it onto the square end of a tap, and go cut some threads!
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