Induction hardening a splined shaft.
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Previously:
https://www.homemadetools.net/forum/...014#post217601
https://www.homemadetools.net/forum/...173#post199577
https://www.homemadetools.net/forum/...792#post190531
https://www.homemadetools.net/forum/...356#post227951
https://www.homemadetools.net/forum/...204#post227402
