Copper butt welder.
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Previously:
https://www.homemadetools.net/forum/...279#post103846
https://www.homemadetools.net/forum/...828#post148406
https://www.homemadetools.net/forum/...982#post171816
https://www.homemadetools.net/forum/...897#post175567
https://www.homemadetools.net/forum/...830#post216947
