Metal spinning a copper bowl.
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Previously:
https://www.homemadetools.net/forum/...692#post229092
https://www.homemadetools.net/forum/...998#post198930
https://www.homemadetools.net/forum/...933#post179530
https://www.homemadetools.net/forum/...097#post191504
https://www.homemadetools.net/forum/...430#post196787
