Changing out my upper A arm due to egged ball joint hole,got the ball joint out,got the nuts,lock @ cam washers off the cam bolts,A arm moves easily by hand. I've pounded the outside of the cam bolts with a sledge, and I had a 3 ft snipe on the inner bolt from under the hood, and they won't budge. Am I missing something here? There is no weight on the A arm, could they be that rusted in??