Knurling a shaft.
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Previously:
https://www.homemadetools.net/forum/...813#post179069
https://www.homemadetools.net/forum/...164#post172465
https://www.homemadetools.net/forum/...016#post171914
https://www.homemadetools.net/forum/...002#post100474
https://www.homemadetools.net/forum/...210#post165425
