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Replacing a jewel in vintage Cyma pocket watch


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There is no emotional attachment to this watch.  I bought it as a donor.  So, for now, it is a learning opportunity.

As you can see (both sides shown), this jewel is broken.  It appears to me to be a friction fit, but I am not certain.

1) remove the old jewel

2) measure the hole in the plate

3) measure the pivot size

4) find a replacement jewel <--- does the story end here?

5) press the replacement jewel in with my handy-dandy Seitz jeweling tool.

Alternative plan:

1) find a jewel that fits the pivot yet larger than the hole in the plate.

2) broach the hole to fit the jewel

3) press the replacement jewel in with my handy-dandy Seitz jeweling tool.

I am all ears!

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After further research, I see this is a "rubbed in" setting. 

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Update. Well, I had this collection of plate jewels (thanks Pop!).  The closest one I had was a little bit larger diameter.  I nudge the plate metal to get it to fit, but there is virtually no metal left to rub in. It is in snug now, but I dont trust it.

Appealing to the horological gods for wisdom.

Again...there is no downside since this is a donor...just hoping to learn and get another notch on my gun.

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2023-02-15 19_54_43-20230215_195045.jpg ‎- Photos.png

2023-02-15 19_54_31-20230215_195112.jpg ‎- Photos.png

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    • Hello and welcome from Leeds. 
    • Unfortunately I'm not that lucky. I started on the train side and after I noticed the binding I pulled everything out except the driving wheel to rule everything else out. It still binds. I'm going to double check that the pinion is fully seated on the staff first, then if no joy I'll push the bridge jewel up a fraction of a mm. Fingers crossed!
    • Happy to have helped, great way to start the day with a win! 🥳
    • Thank you for the advise!! It worked. The setting screw was a lock/unlock to remove the rotor. 
    • I have that French tech sheet too, it is a little different than the English one (eg, it doesn't have the auto works diagram). BTW, it looks like you are looking up the case number in the 1979 ABC supplement. The 1974 ABC catalog does have the 3093 case. As you determined it takes the 1222-5 crystal.  When I serviced my President 'A' (which also takes that crystal), I was able to fit a 29.8 crystal from my DPA crystal assortment. Those are, in my opinion, a great deal. The assortment comes with 10 sizes each from 27.8mm to 32.4mm in 0.2 increments. I pretty much use them for any non-armored crystal that takes a high dome crystal. I think they no longer make them but Cousins has still has some in stock but when I bought them they were around $40 for the set and now they are around $100. Still, at 40 cents a crystal it's still a good deal. For the large driving wheel, I remember I once assembled the keyless/motion works first and when I placed the large driving wheel it was interfering with the setting wheel on the dial side as the teeth were not fully meshing and it wouldn't fully seat. If that isn't the issue I got nothing and am looking forward to see how you solve it 🙂
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