Laser rust removal.
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Previously:
https://www.homemadetools.net/forum/...538#post212344
https://www.homemadetools.net/forum/...384#post215293
https://www.homemadetools.net/forum/...077#post207390
https://www.homemadetools.net/forum/...727#post229229
https://www.homemadetools.net/forum/...015#post226835
