Finally got both of the main landing gear wheels mounted. I think I may have over-done it; won't know until Monday when I can call someone. There is a washer and nut on the valve stem right against the tube; I thought that was supposed to secure the stem to the wheel, but at least two folks have told me it keeps the tube from "pooching" thru the hole in the weel. Anyway, one wheel has it inside the wheel, the other has it external.
Was a real bear trying to get the nut on the valve stem on the external side.