I have done a couple of sets of king pins recently and I use a 20 ton press from Harbor Frieght. At one point, I had the press maxed out and the acetylene torch warming the area when it decided to "pop" loose. The press and all the hammers and tools laying on it jumped a couple of inches off the ground and I about had to go and change my drawers. Sometimes it is amazing what it takes to get these old king pins out. The other side came out really smooth and easy. Go figure.
