Impact wrench chain support arm.
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Previously:
https://www.homemadetools.net/forum/...109#post203366
https://www.homemadetools.net/forum/...875#post198569
https://www.homemadetools.net/forum/...224#post195929
https://www.homemadetools.net/forum/...020#post120222
https://www.homemadetools.net/forum/...188#post145742