What about a blind nut insert kind like this:
http://www.stanleyengineeredfastening.com/brands/avdel/products/threaded-inserts/eurosert
I believe the blind side mushrooms out when you tighten, in your case, the ball stud. The trick is getting one with the proper threads and outside diameter.
Amazon.com has various sizes. You might even find them at Home Depot or the local hardware store.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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