Not sure what Syndrome's issue was with the PRS adapter and the center shaft, I had no problem with it at all. Just had to grind the pin down to fit the slot on the adapter a little, other then that it went together fine. So far it is going together well and I got a spool setup on it for now. I use one of the spool gears from the other car and just ground out the center till it fit the diff tube. It is still round too!!