Watch Glasses/Crystals and Glass Gaskets
Discussions around Watch Glasses/Crystals and Glass Gaskets including Glass/Crystal securing methods.
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Not while maintaining the screw down crown as I mentioned above.
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The spring keeps the threads of the crown and crown tube separated while you are winding the watch. It will work without, but the risk of the thread engaging, or worse, cross-threading, is high. The split stem needs to give the crown enough end float to disengage from the thread, but leave the main part of the stem and the keyless works in the winding position. A standard split stem will probably not have the end-float you need. It has no advantages over a one-piece stem in this application, because when you unscrew the crown the stem will be drawn out and the keyless works will move from the winding position to the setting position. The conventional reason for having a split stem is to enable removal of the movement when the stem release is not accessible, e.g. when you have an integrated case back. As has already been pointed out, you don't need this feature. Hopefully your watchmaker pal will get the screw-down feature to work in harmony with the "special" split stem he has in stock. If not, ask him to remove the screw-down feature ( remove the thread from the crown and / or case) and fit a conventional stem. -
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