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| Joined: | Thu Apr 16th, 2009 |
| Location: | Arctic, Norway |
| Posts: | 5821 |
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It can happen for exemple, if the movement isn't presented correctly in front of the little tube where the crown get screwed, or if the tube isn't perfectly aligned with the case.
So the stem comes out a bit wrong on the side of the tube, then the crown will slightly bend the stem each time you screw it in , as the crown forces automatically the stem in the middle of the tube when screwed on it...
After a while: The stem breaks/snaps because this kind of hardened steal can't bend so much and it's thread weaken it even more.
Your watch should be open to release the broken stem from the movement.
The other stem part should also be taken out of the crown by unscrewing it(you may need to warm the crown to melt some loctite there...)
Then, get sure that the movement is well placed and will present the new stem in the middle of the tube...
Hopefully, your tube is right.
I personnaly saw my watch-maker doing it for a 2824-2.
Good luck