Stripped an exhaust stud hole out of my Polini kit while battling an exhaust leak. I think it had been hanging on by a couple of threads for a while, which is why I couldn't get a perfect seal. got my helicoil kit and took apart the top end last night. Need to drill out the old hole, retap, and insert the helicoil threads. Then the process of cleaning the cylinder, cutting new gaskets, putting the 4 petal back on and sealing it up tight, reassembly, etc. Pain in the butt for such a little problem like an exhaust leak.