Had an exhaust leak at the manifold where the idiots who did my exhaust installation didn't put in a gasket. No problem. Loosen the nuts, drop in fresh gaskets and tighten her back up. A little pb blast, a little elbow grease, easy. Obviously with a rig in pa that gets used it was rusted. Seized even. Got the nut off, but stripped the atud in doing so. We tried for a couple days, letting the pb set in, not using too much torque, etc. It just stripped. So then we tried to remove the stud. No dice. 1010mm stud extractor too big and didn't grip. 8mm too small. Dammit! We were going to weld a nut to the stud and try to remove it that way. Ended up using an exhaust stud clamp. But I had to grind off the end of the stud to make it grab onto the exhaust itself and not the stud. The Sonofabitch doesn't leak, but it looks like Frankenstein monster. I've heard these hold really well, but I'm nervous long term.