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Polishing pivots on a verge pocketwatch balance


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At the beginning of my watch and clock repair class tonight one of the lecturers had a verge pocket watch that needed the pivots polished on the balance so he brought it in to show a safe method of doing this.

The issue with this compared to a normal balance is one of the pallets are very close to the pivot and if you are not careful its very easy to damage the pallet when you polish the pivot..

Below is a photo of the balance and although the pallet is out of focus you can see how close it is to the pivot

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Before you attempt to polish the pivot you need to protect the pallet.

Here you can see the pivot set up to be polished on the Jacot tool with a small wheel which was removed from a junked cheap Japanese watch just slid over the pivot and sitting hard up against the pallet. It had been sanded down in thickness so it was the same thickness as the gap between the end of the pallet and the start of the pivot, providing a barrier to protect the pallet.

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Photo from the other side.

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And once the pivot had been polished and burnished how it was protected again when rounding off the end of the pivot

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Other side

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Job done.

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Something so obvious when you are shown it, but not something I would of thought of doing myself

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    • 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 🙂
    • Not sure, but just looking at it, it seems like the screw on the right may be a fake? The one on the left may not be a screw in the regular sense at all, rather a 2 position device, I think you need to point the slot towards either of the 2 dots and one will secure and one will open. Like I said this is just my best guess looking at the pictures.
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