Per this -> http://www.madehow.com/Volume-3/Screw.html … : one uses a file. Time to start on your forge/bloomery https://www.youtube.com/watch?v=VVV4xeWBIxE … to get the iron
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Then make your surface plates to true your file to be, make a set of chisels... cut, heat treat.. Now go to town on your draw wire
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Then start filing away.
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Or buy a lathe and set the autofeed to cut it :)
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Roll a rod along the end face of a triangular wedge and trace the contact point, then file it?
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So weird how I can clearly define every word in these sentences and yet
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