[KTL]

John,

The spindle is the shaft that the wheel hub/brake disc/wheel bearing assembly is attached to.

My ball joints came off well with the impact. I can see why Otto would say to use it for installation. The impact beats on the socket pretty good. Probably could wear it out sorta quick if you do a lot of work with the socket on the impact. Probably takes a little practice to get the right technique to remove with a chisel (I remember John Walker recommended this technique as well). I'm sure i'd just make removal more difficult by trashing the ball joint threads and body with the chisel!

Just my $.02