Looking at videos on the 3135 movement on youtube.
https://www.youtube.com/watch?v=T1yAy9iWXfs
https://www.youtube.com/watch?v=J1OrJMcNPR0
I do not understand why if the date change is done correctly by turning manually the hands, when the crown shaft is re-engaged the movement presents this shift. The wheels should engage correctly but they do not. I certainly didn't understand a few things about how the 3135 works, and I apologize for that. I'm here to learn. I would like a more technical explanation to the question. I am studying, I have a reference manual to improve my understanding on watchmaking. That's why I'm also looking for an exploded view map of the movement to get a better look at the movement parts.
Sometimes they rush it and set the hands wrong. It’s not that hard to reset it back to midnight but it’s not an easy process either. It would require some tools. Mainly a hand setter and hand removal tool (id recommend just getting the levers).
You have to kind of guess sometimes. Especially on a SH3135 due to the amount of wiggle room in the hands.
Basically. You have to remove the movement and, then the hands. With the hands off, you turn the crown until it’s almost midnight. Then you kind of have to guess where it will land. Once it snaps in to position, stop turning the crown and set the hands at midnight. Sometimes you have to turn the hands a little bit more.
The better way to do it imo is to take the dial off. Turn the crown until the quick set mechanism is very close to hitting the “snap” (the round thing that turns with the crown). You can see the little pinion that sticks out. Wait until it is almost about to flip the date. Put the dial back and turn the crown just a tiny bit and it should snap in to the next date. Then put the hands on at midnight.
There is some guess work but if it’s close to midnight , I’m usually fine with it as long as it’s not an hour difference.
This happens on some gens too.
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