I used a large socket and a c-clamp to do this. It was a little more difficult (not self-aligning) but it worked well. Since I was replacing the bushing on the transmission and had forgotten to do it while it was out of the car, I had to drop the pan and remove the selector linkage. Philips screw to take out the ratcheting spring piece, and a hex screw to remove the gear selector linkage. Just a thought.