Not sure I'd agree on the threads wearing out though, have you seen any worn out upper control arm threads?
Yup, and it is occasionally posted here as well when some one can get a ball joint into the control arm but not get it to torque to spec. Solution from way back was to put 3-4 tack welds on the ball joint to hold it in the control arm.
Now that you mention it I've done that myself a looooong time ago, and it worked!
