This Farmall A I just bought has rear wheel weights, the one on the left was removed but the one on the right hand side is rusted onto the cast iron wheel center extremely well. I don’t think it’s been off in many years and it is beginning to be a real pain. One of the bolts was already removed when I bought it but two of the others snapped the nuts off the bolts trying to loosen them The third bolt snapped off when I tried to turn it out. So now what I have is one completely out, one with the nut & bolt snapped off and the other two with the nuts snapped off. I have soaked the void between the wheel center and the weight with BP Blaster the best I could. Now even with a crow bar trying to pry the weight off all I get is the crow bar flexing and no sign of movement. Can you give me any advice?