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Hello. I’ve got this ETA 2512-1 that i just gave a service. It was running fine (see timegrapher) - maybe not as high amplitude as I wanted, but didn’t change mainspring. After I cased the movement it got completely snowstorm and could barely get a reading. I took the movement out and it was still snowstorm. I could regulate it back, but now it’s running very weak and snowstorm… My plan was to redo the whole thing, and inspect everything under the microscope It had some corrosion, before service but maybe I didn’t got it all out.. EDIT: I did demagnetized the movement after it did the strange reading. Any suggestions?  UPDATE: After sitting and running for 24 hours I get this reading on the timegrapher (without regulation, that can easy be regulated to be perfect) -12 seconds 277 amplitude 2.6ms beat error Is that normal?   (photo of movement is before service) -
By Neverenoughwatches · Posted
Re using the spring that comes out is always worth trying. If everything else is in good working order and the train and escapement are running with as little friction as possible then this spring could very well perform adequately. I would never put in a stronger spring to overcome excess friction. It would be wonderful if there was somewhere a list that held the torque rating that a spring should have and a device with which to test it....available to us mere mortal watch repairers...very wonderful indeed 🙂 -
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welcome to the forum, @akira7799 you could also go for this spring, available at Cousins: Â I sometimes find that it's good to go down in strength (height or thickness) ever so slightly, when going from an old spring to a new S-shaped one + upgrading to new synthetic lubricants. You may otherwise risk re-banking (if everything else in the movement is doing well). Â -
If possible, could you tell me the spring size of this? I have a clock of this type. -
It all depends how much you're willing to spend and if you're happy to try the old mainspring and see what results you get with the possibility of having to swap it at a later stage. The key sizes are the height and thickness with some flexibility on the length depending on the barrel size. If you look at the likes of Cousins for springs around the GR4486 Edit There are still some GR4486 out their. https://www.ebay.com/itm/126715574424?ff3=2&toolid=10044&customid=&lgeo=1&vectorid=229508&item=126715574424&ufes_redirect=true
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