SuperBeetle: What tool to remove stubborn control arm ball joint?

SuperBeetle project:    • Get 1972 SuperBeetle back on road  
I'm refurbishing my 1972 SuperBeetle. There are 3 main projects. Replace all the bushings in the front suspension to eliminate the "super-shimmy". Refurbish the fuel system. And finish the engine rebuild that I worked on in the spring.

The right control arm came out with some work (   • SuperBeetle front suspension teardown...  ) but the ball joint just WOULD NOT separate. That video even has me taking a big hammer to it. It mushroomed the top of the spindle but it still didn't budge.

I had to buy a specific ball joint removal tool. This video shows the tool that worked and a few others, and the actual moment of separation.