Induction hardening a part.
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Previously:
https://www.homemadetools.net/forum/...408#post208620
https://www.homemadetools.net/forum/...333#post208285
https://www.homemadetools.net/forum/...173#post199577
https://www.homemadetools.net/forum/...792#post190531
https://www.homemadetools.net/forum/...449#post173665
