Electro-hydraulic hole punch.
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Previously:
https://www.homemadetools.net/forum/...616#post136355
https://www.homemadetools.net/forum/...172#post145675
https://www.homemadetools.net/forum/...618#post139635
https://www.homemadetools.net/forum/...913#post137451
https://www.homemadetools.net/forum/...773#post143963
