If you don't have it apart at the moment, take care to notice and make a note of which way the bearing spacer goes. The lip that go into the bearings is longer on one side than the other, and you would think that the longer one would go into the double row bearing, but not so. Also you can get a sealed double row bearing that fits the hub from Walridge. No machining required. His part number 06-7688S. It works in the front hub too. Make sure the spedo gearbox does not rub on the hub plate when all is installed and tightened. You can either shim the tophat that goes in the gearbox, or get a new tophat spacer. There are threads on both these things if you look for them.
Dave
69S project