Winding a large toroidal coil.
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Previously:
https://www.homemadetools.net/forum/...202#post230604
https://www.homemadetools.net/forum/...586#post197426
https://www.homemadetools.net/forum/...469#post215540
https://www.homemadetools.net/forum/...913#post213619
https://www.homemadetools.net/forum/...012#post160553
