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The idea that a screw-down crown is somehow a good thing is another popular delusion. It was the first solution found to the problem of waterproofing the crown, and it still works, but it has the disadvantage of applying friction to the seal with pressure, every time you tighten it and every time you unscrew it, which causes the seal to wear out. It's okay if you replace the seal frequently enough, but all the other methods of constructing a waterproof crown are better.
What about the Rolex Triplock crown?
What are the better methods of waterproofing the crown?