Drill chuck electrode holder.
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Previously:
https://www.homemadetools.net/forum/...257#post116114
https://www.homemadetools.net/forum/...743#post152108
https://www.homemadetools.net/forum/...828#post148406
https://www.homemadetools.net/forum/...806#post137018
https://www.homemadetools.net/forum/...666#post136569