Did you know it's possible to disassemble a Rolex crown and rotate its head on the plunger / clutch assembly? Then if one were to carefully measure stem penetration into movements, and if one had a large assortment of crown gaskets of microscopically varying thicknesses, and if one were to methodically and carefully polish microscopic amounts of length from the ends of crown tubes, and if one were to methodically measure and insert tiny amounts of graphite into crowns before screwing them onto stems, it would theoretically *cough* be possible to make it so every crown on every watch in a collection, when screwed down, would have its coronet oriented precisely vertically.
Just sayin......