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Before he chisels away and rounds off every last bit of it, you need to weld a new extra large nut onto the stripped bolt. The problem isn't that it's too tight. It's too tight for your friend to have gotten off with his 12 point socket at a lazy angle. You have to use a 6pt socket that's dead on. Either it comes out, or it breaks the head off because it was actually too tight. If it rounds over you just didn't get a good enough grip. Welding a nut on the rounded over part gives you that grip. If it snaps off then that's perfect, because it won't have any more torque holding it in
Maybe then the chisel would work to spin it out. But I always weld nut after nut until it comes. Nothing else works for me after it's fully rounded (except vice grips on occasion when they're fully cranked down on it with gorilla grip strength)
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