Chain trench cutter.
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Previously:
https://www.homemadetools.net/forum/...452#post181829
https://www.homemadetools.net/forum/...831#post206563
https://www.homemadetools.net/forum/...017#post120191
https://www.homemadetools.net/forum/...986#post164465
https://www.homemadetools.net/forum/...491#post122730
