There are a couple of instances where parts are attached to the frame of the vehicle via body bolts, threaded directly into a machine hole in the body of the car. Some examples are the cross vehicle support bar bolts, the degas bottle support bolts, the fuel hose bracket bolt, etc. In my case, some were damaged by rust. Others by me (in my infinite wisdom) using an impact wrench, such that little bits of the coiled thread came out. Given that my metal fabrication and machining knowledge and experience is pretty much zero, I hope someone can help: I'm hoping to keep using the same bolt. Are there any solutions for that? I'm thinking of just tapping the holes again using a chaser tap. As far as I know, the success of this will depend on my luck, based on how much of the thread was eaten away. Is there anything I should avoid? Am I likely to cause more damage than actually repair anything? As for rusted (or perhaps slightly cross threaded bolts), I'm also planning to chase the threads with a die. Again, this is about body bolts, where perfection is significantly less important than in dealing with things like head bolts.