Gasoline engine impact wrench.
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Previously:
https://www.homemadetools.net/forum/...875#post198569
https://www.homemadetools.net/forum/...692#post197811
https://www.homemadetools.net/forum/...224#post195929
https://www.homemadetools.net/forum/...692#post174636
https://www.homemadetools.net/forum/...873#post179259