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Discussion Starter · #1 ·
Hi there everyone.

I have been buying and modding and doing up old and new Vostok Amphibias and Seiko 7S26 watches, cases and movements for a little while now.
I am definitely a kitchen table kind of modder / repairer and as a result I do run the risk of messing things up every now and then.

So far I haven't come up against anything too disheartening or difficult, until now.

I purchased a 24hr (2431B) movement from Meranom a while ago now with the intention of dropping it in a 710 case with a custom 24hr dial I made.

Once I got around to actually installing the mechanism I made the decidedly school boy error of slipping off the bolt that attaches the rotor to the mechanism and slipped right into the balance wheel.
The mechanism was functioning perfectly before this and now the balance spins freely for a few seconds before stopping.

I assume I have bent the spring or upset the balance wheel somehow and it is not spinning freely anymore.

I did contact Meranom, but to send it back to them for a service (as warranty is void now) seems expensive and time consuming.
I have spoken to some other watch makers and repairers who specialise on Vostoks and I may as well buy a new mechanism for what they want to charge for the repairs and service.

I know that Meranom sell balance wheels cheaply so how difficult would it be for me to replace this myself? Does anyone have experience of mistakes like this? Or has anyone repaired a watch in this fashion?!

As ever, thank you so much for taking the time to read this.

GJC
 

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Why dont you send it to Dafydd Ellis in Porthmadog - probably cheaper than a new movement - my guess is that the pallet fork has moved.
 

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Did you bust the hair spring or did you pop a jewel off the pallet fork? Grab a loop and take a peek and see what exactly you broke. It sounds like you popped the hair spring so me, but I could be wrong (it's happened before).

You might be able to just reattach the spring but it'll be shorter so you'll have to time it. If the spring is busted and you don't want to have to run the risk of it not being regulatable, drop another balance in there. It's not the most difficult thing you will ever do in your life, but it ain't exactly easy.
 

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Personally, as another enthusiast amateur I'd take a look. If indeed the spring is damaged I'd have a go at 're fitting it , the pallet fork thing is worth having a go at.
Fitting the balance as a whole is quite fiddly but with a bit of patience it is doable. It's already not working so you don't really have much to lose and if you fix it you get a lot of satisfaction.
Good luck with it.
 

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Fitting a new balance complete is no problem as long as you have the tools. a plus is they are already fitted with the balance spring in beat, First remove the old balance and check the pallet, broken impulse jewels and pivots are intact and go from there
 

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If it runs for a few seconds before stopping, it could be the fuel pump.
I laughed and laughed and laughed...

But I'd check the fuel filter first, cheaper than a pump and generally easier to get to...
 

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Discussion Starter · #8 ·
Thanks so much for all your comments.
I'll try them all out and see what happens! Maybe it is the fuel!!? It hasn't been worn so maybe it just needs a few spins to get it going consistently.

Thanks again.
 

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My money is on that you broke the hairspring, it's the only thing that would allow the balance to spin the way you described. Meranom sells a complete balance bridge for $6. If it's indeed broken you'll pull your hair out trying to fudge things back together in a functional sort of way. Replace the whole damn thing and be done..
 

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My money is on that you broke the hairspring, it's the only thing that would allow the balance to spin the way you described. Meranom sells a complete balance bridge for $6. If it's indeed broken you'll pull your hair out trying to fudge things back together in a functional sort of way. Replace the whole damn thing and be done..
If he reattached the hair couldn't he move the collet to line up the impulse better and then try to finish it out with the fine adjustment? I mean, the frequency could be high with a shorter hair, but if it's just a titch of spring that's broken from the end, surely he could regulate it?

That is of course assuming the spring is broken and it's not a busted pallet jewel or some such. Kind of hard to tell from here.
 

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If he reattached the hair couldn't he move the collet to line up the impulse better and then try to finish it out with the fine adjustment? I mean, the frequency could be high with a shorter hair, but if it's just a titch of spring that's broken from the end, surely he could regulate it?

That is of course assuming the spring is broken and it's not a busted pallet jewel or some such. Kind of hard to tell from here.
I read "the balance spins freely" to mean spins in one direction meaning a broken or detached hairspring, but after rereading it I guess he could also mean the balance oscillates freely and then settles, which could be a plethora of things from a hairspring issue to a broken pivot to a pallet jewel like you say.

If the hairspring is broken, detached, mangled... whatever, I still think he's better off replacing it. If manages to reattach it to the stud/cock, adjust the collet and get it regulated I'd consider it a miracle if it was running properly and in beat and for $6 why waste an afternoon
 
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