Duct crimping tool.
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Previously:
https://www.homemadetools.net/forum/...502#post151237
https://www.homemadetools.net/forum/...168#post161153
https://www.homemadetools.net/forum/...068#post164793
https://www.homemadetools.net/forum/...886#post175498
https://www.homemadetools.net/forum/...879#post148603
