Punching sprockets.
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Previously:
https://www.homemadetools.net/forum/...477#post162263
https://www.homemadetools.net/forum/...770#post194047
https://www.homemadetools.net/forum/...942#post224062
https://www.homemadetools.net/forum/...131#post221479
https://www.homemadetools.net/forum/...048#post191332