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I got a wheel for each grit. I don't think different greaseless grits should be mixed on a wheel. The compounds and rouges maybe (someone verify or correct me), but I think it's still easier to...

+1 on what's already been suggested. I found this thread quite helpful:
http://straightrazorpalace.com/workshop/46444-buffer-info-thread.html

The workshop sticky has a ton of helpful links,...