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I have question, I have removed the upper a arms on my 81. Bolts on one side turned. I have ordered new knurled bolts. Not sure this will solve the problem. I feel the hole in the frame might have enlarged don't know for sure but may have.
If they enlarged and new bolts spin would welding the bolts in place be an alternative?
i had one of the bolts on my 79 turn while removing it, i took a center punch and punched the metal around the hole, moving the metal in towards the hole. bolt held on reassembly, but i guess a small tac weld would serve the purpose.