Toroidal coil winding machine.
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Previously:
https://www.homemadetools.net/forum/...644#post178296
https://www.homemadetools.net/forum/...426#post166223
https://www.homemadetools.net/forum/...012#post160553
https://www.homemadetools.net/forum/...904#post160170
https://www.homemadetools.net/forum/...416#post162001