To replace the torque arm  with a set screw and ball bearing:
Install the snap ring on the torque tube.
Place the torque arm with the springs on the torque tube. Install the steel ball  and set screw  with light torque to align the two pieces. Back off the set screw 1/8th of a turn.
Install the T-0081 preload tool  on the turret housing.
Remove the jack screws from the threaded holes  if used.
Tighten the set screw  with Loctite (blue 242) to 10 ft-lb. Lock the jam nut  to 35 ft-lb.
Torque the two clamp bolts  to 80 ft-lb.
Follow the alignment procedure before installing the rear gearbox cover.