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I guess the one I thought was new wasn't.....NEW, upper control arms never have threads in them.
They are manufactured bare, smooth.
The ball joint, to be inserted in the UCA, cuts the threads.
Then forever, and ever, that control arm will have the "threads" that a replacement ball joint should follow, in tightening down.
If not, just tack weld the ball joint, to the arm, in 3 or 4 spots, and your done.
Easy, peasy.
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