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Repinning stud advice?


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Hi all,

I am working on a cute Pobeda for my significant other. It was running great, but after taking the balance on and off a few times, the hairspring stud has come loose. The pin just appears to have backed out of its hole - the hairspring is vertical but the stud is flopping around all over the place.

My basic plan is to, under a microscope, hold the stud upright, and push the pin back in using hairspring tweezers or an oiler. Any advice about tools or methods? Seems straightforward but obviously there is much that can go wrong here. Pivots are good and I already reshaped the overcoil, so I'd rather not junk this balance. Thanks.

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Normally this is done with a studding table, which is a tool that clamps the stud at whatever height you want so you can clamp it with the hole sticking out at table height. Slide the spring in, then insert pin.

 

Most folks don't have that tool, so the next best thing is the cock itself. Fix the stud in place, insert spring, then pin. To press the pin tight it's very useful to modify a pair of tweezers by removing about 0.25mm from the end of one side; now you can rest against one side of the stud with the short end and squeeze the pin in with the other side.

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Hi Nicklesilver   any chance of a picture of the studding table sounds quite an ingenious device.  I have always used the cock as is and threaded the spring when pinning (days long gone now)

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Posted (edited)

Thanks guys for your resposes. @Nucejoe, the movement is a Zim 2602 with a fixed stud. Here are some pictures of the balance and stud itself. As you can see, the stud hasn't come off - it's just flopping around all over the place. I can flip the stud to lean the other direction and take the same picture. Do you guys advise removing the pin and starting from scratch, or just trying to push the pin back in? And yes, I know the pin looks super weird and rough here.

IMG_20210304_081447506.jpg

IMG_20210304_081416409.jpg

Edited by JohnC
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Hi JohnC,

Doesn't look it would creat any noticable beat error, which is a pain to adjust with fixed stud holders.

In case you feel no master re-pin ner, I refit the stud with the cock, put em back on the mainplate and just use a bit of epoxy 5 to keep the hairspring in place. 

Good luck.

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