Nanuq Posted September 2, 2014 Report Share Posted September 2, 2014 Freddy, thanks again for posting this. I'm having a bit of trouble with an 8mm BREVET crown and referred back to this for help. On my 8mm crown the central stem tube is square and does not protrude from the crown post very far at all; its face is nearly flush with the crown post face, perhaps proud of that face by 1/10mm or less. When I unscrew the crown from its tube there is good spring action to extend the crown from the tube. But often when I attempt to set the time or wind the watch, the crown just spins as if it's disconnected from the stem. Investigation reveals that the stem tube is down inside the crown post, so the square portion of its shape does not engage the crown post. If I pull out slightly on the crown and turn it, I feel it spin and then click out into place so the stem tube is again protruding from the crown post. Then I am able to wind and se the watch. This makes it seem like the inner post spring is too short. But like I said there is good spring tension to pop the crown out from the tube when I unscrew it from the closed/sealed position. Any thoughts? I suspect (sadly) that I have got a very sophisticated and nearly perfect fake crown here. All other details are exactly right. Link to comment Share on other sites More sharing options...
Bc1221 Posted September 2, 2014 Report Share Posted September 2, 2014 great info! i didnt even know the crowns came apart like that. Link to comment Share on other sites More sharing options...
freddy333 Posted September 3, 2014 Author Report Share Posted September 3, 2014 Nanuq - Unfortunately, it does sound like you have a rep crown, but some good, clear macros (especially, of the internal components) would be very helpful. Have you removed (unscrewed) the inner components to inspect the spring? Generally, when the crown feels like it is slipping during winding, it is because either the spring is worn (or collapsed) or the flats of the internal components have rounded - both, from what I have seen, are common problems on either aftermarket or very old gen crowns. Link to comment Share on other sites More sharing options...
Rg500 Posted September 15, 2014 Report Share Posted September 15, 2014 Thank you, thank you, thank you! Awesome post freddy333. Just managed to salvage a 90's twinlock crown that I thought was toast by combining the best parts from 2. 1 Link to comment Share on other sites More sharing options...
freddy333 Posted September 16, 2014 Author Report Share Posted September 16, 2014 Nice work. Always good to salvage a vintage Rolex part. 1 Link to comment Share on other sites More sharing options...
Nightwatch Posted September 16, 2014 Report Share Posted September 16, 2014 This contains amazing detail/ information and pics and is so helpful, even after several years. Really appreciated. Thanks a lot freddy333 1 Link to comment Share on other sites More sharing options...
freddy333 Posted July 25, 2016 Author Report Share Posted July 25, 2016 This is the 1st of a number of old threads I will be bumping for those who may not have seen some of the more technical articles that RWG is famous for. 2 Link to comment Share on other sites More sharing options...
Nanuq Posted July 25, 2016 Report Share Posted July 25, 2016 Well done, Freddy. I stickied it and put it in the How-To section. 1 Link to comment Share on other sites More sharing options...
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