Several special tools were used in final assembly. It helped that the units had not yet been subjected to abuse or corrosion. The installation tool pushed against the perimeter of the race as pushing on the taper had a tendency to increase the diameter. The extractor was a thick pipe of sorts split into six sections and tapered toward the end leaving a lip at the end to catch the inner diameter of the race when expanded with a cone shaped center section. After a few hundred gear cases the technician knew from the ware pattern of the white grease used just how many of various thickness of shims were needed to center the contact pattern on the gear teeth. Not having a lathe, I used my Dremel tool to remove enough material to use a three jawed expansion puller on my slide hammer. Most of the time just tightening the jaws is enough to pop it loose. (I am not above modifying existing tools to do the job) It also worked well with pulling worn shaft seals.
