Anodizing bolts.
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Previously:
https://www.homemadetools.net/forum/...354#post116580
https://www.homemadetools.net/forum/...785#post152268
https://www.homemadetools.net/forum/...520#post155036
https://www.homemadetools.net/forum/...7894#post86435
https://www.homemadetools.net/forum/...259#post188427