The screw is not long enough to see (or even feel) that you are fully connected to the ball joint. You can't put your finger in to hold the bolt. When I tried to pull out the second ball joint, it seemed to me that the screw was fully tightened; it's not like this. on a full try I pulled the threads off the screw; now it's useless. try tapping the screw back out or replace it.
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