Tripod definately is correct about the Kroil. The stuff is majic in a can. When I run into the stuck bolt situation I use Kroil and a rivet gun. The rivet gun will get most any bolt out with the constant hitting and vibration. You can buy a cheap one at Harbor Freight or a similar store. You will need to use something like a brass drift in between the rivet set and the bolt. If you dont the rivet set will mushroom out the end of the bolt and then you need to resort to cutting.