2 ratty paperbacks, lots of grease and a rubber mallet works great! Jonny5 and I were both drunk and we had to use what we had around, and it worked!

Starting the cups nice and straight can be tricky (depending on the fit). If the cups tilt, push them back out with something round. a flat bladed screw driver will dent the cups

Oh, and being the scatter brain, I made the mistake of mixing up the top and bottom bearings recently. Was puzzling until I realized that they were not interchangable on the HS I was using.