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Reforming a hairspring curve - Breguet Overcurve HS


I am correcting a deformed hairspring and need to set the curve for the regulator pins.  De Carle mentions using curve-forming tweezers, which I cannot yet find.  What are the alternate practices for forming this curved portion of the over curve?




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Save your money, the tweezers in the hswalsh link is of little use. OH did a very good job finding this tool, but it is the smallest of the set, too small for gents- or pocketwatches. I suppose it is the remains of a long sold stock.
My old Bergeon catalog shows them, but they were no more available when the catalog was issued.
Yes, I don't think they've been made for some time and any offered as new were/are remains of old stock.

There was a time even in the 70s as mechanical watches were heading toward supposed extinction that women churned out piecework of vibrated springs matched to balances from home. They'd have a Greiner Spiromatic and some killer tweezers and do this stuff at a speed and precision that's unbelievable. I'm almost sure the lady I met at Parmigiani from the post above was one of these workers, pulled in from semiretirement.

There's no demand for such tools now and there's enough on the used market to satisfy the collectors and occasional users. My set has been updated numerous times in the last 20 years as I found better examples to replace the ones I had, selling off the lesser pieces. Being in Switzerland we're a bit spoiled as you stumble upon this stuff at random flea markets. I found a selection of screw slotting files a few months back, really fine ones they don't make anymore, for two bucks a piece, new old stock.

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OK, here are the bad boys. The curving ones I have go from 00 to 5, the lifting ones from 00 to 4. The example hairspring would be about right for a deck watch- very big, and the largest of both sets worked well. You can see in the 4th pic that the end of the lifting tweezers can be adjusted for the thickness of the spring (red circle) and how far it pushes (screw in blue circle). I just did a simple overcoil, there are many shapes, here the goal was to get the curve to follow one of the spirals more or less imagining in our imaginary watch that would be where the regulator lies.

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On 8/18/2019 at 8:58 AM, nickelsilver said:

Those are for raising the overcoil, the curved ones for forming its curve. There are about 8 different sizes of each.


33 minutes ago, oldhippy said:

Here is a link for the Breguet Hairspring Tweezers, Dumont

Worth to remind once again that as Master nickelsilver nicely explained, the 00 size available from  Cousins UK, is the smallest of all were once available, and is good for the tiniest hairspring only.

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