Polishing metal discs.
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Previously:
https://www.homemadetools.net/forum/...383#post219027
https://www.homemadetools.net/forum/...904#post217237
https://www.homemadetools.net/forum/...380#post208488
https://www.homemadetools.net/forum/...835#post198392
https://www.homemadetools.net/forum/...388#post208551
