Whats the best way to remove upper ball joints?

The factory ball joint "thread" in the UCA doesn't appear to be a formed thread, but rather was cut as the original ball joint was screwed in. A few times in and out and the thread can disappear, so take care. Despite that, it was loose on one side of my 64 Valiant after a rebuild so I had to tack weld the ball joint in. The 3-bolt design on other cars like GM, would have been better for us fooling with these cars 40 years later.