A little more info??? Is it the ball joint fitting? Did the threads strip or did it just fall out? worst case is that if you cannot solve the fitting problem and it is your ball joint just replace the ball joint. Not much money involved there.
If it is a ball joint zerk, you could just replace the zerk with one with threads one size larger. They are typically self tapping so using a slightly larger one should just cut new threads as you install it.
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