Benrus jewel
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I've never worked on one with splines and that's what I've always done. In the past I've even just used a torx bit. -
This watch came from a watchmakers estate. It has an AS970 with a center sweep seconds hand. I am having an issue with the monocoque case where when I seat the crystal the watch stops. What is happening is that the seconds hand hits the top of the crystal (it has left a small indentation in the crystal where it has worn it away) and then the hands stop moving. The movement goes into the case and then the crystal sits on top of the case, and then the bezel goes on over the crystal and is held in place with grub screws on the back of the watch. The image below shows the underside of the crystal with what appears to be some sort of repair job to the crystal gasket. I’m guessing the crystal isn’t the original and because the crystal isn’t high enough to clear the seconds hand, some gasket material was glued to the crystal to increase the height of the crystal, but not by enough. I’m guessing I won’t be able to source a replacement crystal, but if anyone knows where I can find this style of crystal can you give a link to them? If I can’t source a new crystal then I guess my next best solution is to try and add more or replace the current gasket with something thicker to get the crystal off of the seconds hand. Any suggestions as to 1) What kind of gasket should I use and where would I source it, and 2) would I need to glue it to the crystal like it currently is or can I just lay the gasket on the case and fit the crystal as normal? -
By nevenbekriev · Posted
According to my own understanding of the matter, this watch has only one subdial and it is of the minute register. And, it has central chrono hand, which is not on subdial. So, You problem is the chrono hand... The most probable reason is that the hand is not firmly seated on the shaft. This is a regular problem of such hands as the shock when resetting is huge so the friction between the shaft and the hand's bush sometimes gives and the hand's position on the shaft changes. The hand must be pressed really tight. If the hole of the bush is enlarged, it is possible to shrink it. The best way to do it is in a lathe's collet. In the service centers they often don't reuse the hands, but rather replace them in order to avoid such problem. Another reason may be the bush is loose in the hand. And, of course, the movement may be out of order. -
The first place I looked, but all the tools seem to be for tubes with an internal spline. I guess I could just ram one in and turn 🥴 Which is why I asked. I'm pretty good at finding tech sheets etc, but so far have been unable to find anything on Rolex case part numbers. (I tried " ROL CS#7935" on Jules Borel, but it only gave the crystal) -
So if you've just bought a used movement in unknown condition then I think it needs a service.
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