The rented c-clamp press didn't work for me, just bent the c-clamp open. Since I had the arm off anyway I just threw it in the 12 ton bottle jack press - It was all it could do with a ton of heat to get the lower ball joint to pop out. Looking back I should have just bought new Moog arms and been done same day instead of the 3 days it took me to mess around with rebuilding the old.
The mechanic I took it to ended up doing the same thing and said it was a PITA.