Making ceramic electrical insulators.
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Previously:
https://www.homemadetools.net/forum/...959#post191100
https://www.homemadetools.net/forum/...704#post182755
https://www.homemadetools.net/forum/...090#post203290
https://www.homemadetools.net/forum/...282#post214954
https://www.homemadetools.net/forum/...272#post208104
