Sheetmetal punch and die.
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Previously:
https://www.homemadetools.net/forum/...394#post150812
https://www.homemadetools.net/forum/...388#post150782
https://www.homemadetools.net/forum/...820#post198331
https://www.homemadetools.net/forum/...969#post194868
https://www.homemadetools.net/forum/...571#post185845
