I had the same problem. Take a look at them closely. Mine were just full of powder coat that was relatively easy to clean out using the tip of a needle file. After that I just greased the threads on the ball joint and carefully eased it in and out to clean any remaining muck that the file couldn't deal with.
If the threads really are poor you may be able to clean them up using a special thread file. Not used one myself but they are frequently used when restoring older cars where there are no spare parts available and you have no choice but to clean up and re-use what you have.
Cheers
Robin
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