Just an update regarding keeping the 90 weight in the rack before I resorted to replacement with grease...
I tried two seals- one from Victoria BM and one from Moss Europe.
The Victoria seal leaked for several days, but then swelled sufficiently to stop the leak. I have not mounted the rack yet, but no seepage.
The Moss seal was more expensive and seemed more dense initially, but the center hole is larger than the steering column diameter. It never swelled sufficiently to stop the leakage, even after a week.
Between the two seals I lost one ounce of oil (out of 10) before I finally gave up on the Moss seal and re-installed the Victoria unit.
I've looked for an oil-resistant grease that I could pack into the seal, but couldn't find any. If I could locate some I would consider adding that to the seal when it is new and dry.
Michael