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I've used my Sears Craftsman Professional *electric* 1/2" impact gun in a pinch - that's all we had at the time.
That gun is only rated at 270 lb-ft.
I typically use Permatex "PST" (pipe sealant with teflon) to seal the flywheel nut to the flywheel / rear counterweight and Loctite red on the threads.
I've never had the assembly loosen.
-Ted
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