I had a friend who re-set his ball joint. Put the tool in and lightly tapped as he slowly turned the tool around and around. Put the engine together and right after it started the top broke out of the piston because he work hardened it.Set it up and give it a good shot with a hammer ONE TIME, then turn it 180 degrees and give it a smaller shot to close the cup where the slot in the tool was. If the ball joint feels stiff don't worry, it will loosen up as soon as the engine starts.Motorman