Oil collection technique
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I'm not sure if the hand is original or a replacement, but it has been in use for a while as it has worn a divot in the center of the crystal. This is the side profile (bezel not 100% seated): -
for this particular Seiko movements there is a special movement holder specifically for the sweep chronograph hand. It allows you to push the button in for returning to zero and hold it in place. While pushing the second hand on it the proper location. It also provides support underneath C don't knock the jewel allowed because it requires a lot of force to put the chronograph hand on. For instance this is why a lot of Swiss chronograph watches when you go to remove the hands they will disintegrate because they been put on with so much force that they basically are considered non-removable and in the service centers they would get an entire replacement hand kit which we do not get so chronograph hands need to go on typically very very tight as others have mentioned there's a lot of force on them when the returning to zero. -
What does the side profile look like. Is that the correct seconds hand? -
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. Edit What size is the tube & crown?
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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?
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