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Repinning stud advice?

JohnC

By JohnC
in Watch Repairs Help & Advice

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JohnC

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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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nickelsilver Distinguished Member

nickelsilver

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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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JohnC WRT Addict

JohnC

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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

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Nucejoe Distinguished Member

Nucejoe

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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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    • GuyMontag
      1972 Bulova President "E" Sea King 11ACACB movement

      By GuyMontag · Posted

      Yeah, I saw that in the tech sheet but I don't see how it can be adequately cleaned with the friction pinion still in place. I've accidentally pulled the arbor right out of the wheel once when I used a presto tool to try and remove it. Mark shows how he does it with the Platax tool. Those are a little too pricey for me so I got one of these from Aliexpress and I just push down on the arbor with the end of my brass tweezers. That usually gets it most of the way out and then I just grab the wheel with one hand the and the friction pinion with the other and gently rotate them until it pops off. Probably not the best way but it's seemed to work for me so far.    
    • Zedster
      Movement inserted from crytal side

      By Zedster · Posted

      Thanks, Jon Sounds like a plan. Obviously I'll have the face on so do you think gripping with the holder will create any problems, but I will check in the morning to see how feasible it is but I assume it only needs to be lightly held. As for holding the movement instead of the holder won't be possible in this scenario as one hand will be puling on the stem while the other pushes the spring down. That was my initial concern is how the hell can I do this with only one pair of hands. All the other times I've had to remove the stem hasn't been a problem, apart from the force required to release the stem from the setting lever, but now I need to fit the face and hands its sent me into panic mode. If it had the screw type release things would be a lot simpler but that's life 😀   Another thing I will need to consider is once the dial and hands are fitted and the movement is sitting in the case I will need to turn it over to put the case screws in. I saw a vid on Wristwatch revival where he lightly fitted the crystal and bezel so he could turn it over, is this the only option or is there another method?      
    • nevenbekriev
      Main spring

      By nevenbekriev · Posted

      Hi Jon, do You think that relation spring torque - amplitude is linear? I would rather guess that the amplitude should be proportional to the square of the torque. I had once idea to check it, but still haven't.
    • ManSkirtBrew
      1972 Bulova President "E" Sea King 11ACACB movement

      By ManSkirtBrew · Posted

      I did not. I thought about it, but I had cleaned it in my ultrasonic, and the tech sheet shows lubricating it in place already assembled, so I figured discretion was the better part of valor. Although since I have to depth the jewels anyway, maybe I pull the pinion off to rule it out 100% as part of the problem. Do you know if there's a safe way to do it? I don't want to use a puller because it would push down on the plane of the wheel, and that seems like a Bad Idea. I thought about using a roller table remover, but I don't think I have a hole stake pointy enough to push it down.
    • oldhippy
      Movement inserted from crytal side

      By oldhippy · Posted

      Before putting it back in the case I would fit the hands and use a pin vice on the stem to make sure the hands were in line. 
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