Sheetmetal cone bender.
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Previously:
https://www.homemadetools.net/forum/...867#post190799
https://www.homemadetools.net/forum/...571#post185845
https://www.homemadetools.net/forum/...108#post184348
https://www.homemadetools.net/forum/...574#post182201
https://www.homemadetools.net/forum/...143#post180364