One of the most important features of your Rolex Oyster is its patented Twinlock or Triplock winding crown mechanism. The precision threaded case tube allows the winding crown to be firmly secured against the case. When your Oyster case is overhauled, both the winding crown and case tube are thoroughly examined to guarantee a perfect fit.
Whenever you open your winding crown, it is important to remember to tighten it securely again when done, especially prior to engaging in water related activities. This ensures that the original pressure-proof characteristics of your Rolex Oyster will remain intact, providing proper protection for its precision movement.