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Cal. 1861 Crown and stem came out when setting time

Nono01
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If the thread isn't in the right sub-forum, please move it to the correct one.

Well, this is awkward. I have a 3570.50 (1861 Speedy Pro), fully serviced in 2020 by Certified Omega watchmaker. Today, I picked up the watch, wound it, and tried to set the time. I pulled the crown out to the first position, and the entire crown and stem came out as if they were dipped in butter—no friction whatsoever.

I pushed it back in, and now the “zero” position (the manual winding position) is gone. With the crown fully pushed in, it sets the time. The watch still runs when I shake it.

It hasn't been dropped or banged, which is very strange. I’m going to drop it off at a watchmaker, but before I do, does anyone have an idea what might have gone wrong? I'm just curious. 😀

Thanks, guys. Cheers!
 
Archer
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The setting lever screw has likely come loose - this would simply require taking the case back off, the tightening the screw. If the screw has snapped off in the setting lever, it would require a more intense intervention, and possibly the removal of the hands and dial.
 
Nono01
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Archer Archer
The setting lever screw has likely come loose - this would simply require taking the case back off, the tightening the screw. If the screw has snapped off in the setting lever, it would require a more intense intervention, and possibly the removal of the hands and dial.
Thank you for clarifying that, good thing it doesn't need a full service then. Is this something I could do (I do have a set of tools, caseback opener and screwdrivers or does this require a watchmaker - I mean for the first situation, where it's required to tightenning the screw)? Thank you
 
Archer
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Nono01 Nono01
Thank you for clarifying that, good thing it doesn't need a full service then. Is this something I could do (I do have a set of tools, caseback opener and screwdrivers or does this require a watchmaker - I mean for the first situation, where it's required to tightenning the screw)? Thank you
You could try it yourself. If the screw has backed out too far already, or in the process of trying to fix this you back it out too far, then for sure more work will be needed.

When you are starting out, I would first screw the screw all the way in, without the stem inserted. Then back it out 1.5 turns, use the screwdriver to push the screw down, then see if the stem goes in all the way. If not, unscrew it just a bit more and try again. Once the stem is all the way in, tighten the screw and see if the stem stays in.
 
Nono01
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Than you, I will try it. Is this the screw in question?

Screenshot_20250301_010750_Chrome.webp
 
Archer
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^^^That’s the one. Thanks Jim.
 
Nono01
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Thank you gentleman, I manage to solve the issue using @Archer post. Now I got position ZERO (winding) and position 1. But, on the position ZERO, it only winds 3-4 turns and that's it. And the movement has been stationary for weeks, so no power in that mainspring. Did I tighten the screw too much?

Thank you
Edited:
 
Archer
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It would be very unusual for the stem insertion to cause such an issue.
 
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