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Posted

I found this watch in an local online auction lot. As soon as I opened the back she sprang to life.  I put her on the timegrapher and she was running fast.  As I adjusted the arm she resisted and then broke free and went all the way to the - side.  As soon as I tried to go back the arm popped off. Does anyone know how I reattach it? 

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Posted

Hi  short of taking off the balance cock removing the balance and spring  then dismantle the setting and re assemble, has the regulator damaged the balance spring ? as the spring runs through the index pins  but in any case it all has to come to bits, trying to press it back on will only lead to further damage.        cheers

Posted

Thank you for your answer. So after it is all disassembled  I use a staking set and just press it back in? 

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    • Good stuff, thanks!!!  I'm going to save it and re-read your post and watch the video again.  I have a few follow-up question:  My understanding is that the spring vibrates or breathes between the the two regulator pins. When the pins are fully open the effective spring length is from the stud and theoretically no rate adjustment can be made by moving the regulator arm. As the pins are closed the spring gets closer to one side of the regulator block but doesn't touch a pin. You can still move the regulator carrier the entire terminal curve without upsetting the coils.  The rate can now be adjusted using the regulator because the effective spring length can be modified.  My question is: Does the hairspring bounce off and touch one of the pins as it breathes? Is that why the effective hairspring length is adjusted by moving the regulator?  And follow-up: How is amplitude affected by the spring between the pins? Does fully open pins, dial up position = max amplitude?  When spring adjusted to 1/2 width still = max amplitude? When I have crown down gravity is pulling the spring against one of the pins and I would expect rate to go up and amplitude to go down. Is that correct?
    • A quick Google for Longines 25.17 found several similar watches - like this one with writing on the case back similar to yours https://benjaminmarcello.nl/product/longines-cal-25-17-tank-from-1938/
    • Apps like Watch Accuracy Meter can be inaccurate, and will read some watches better than others.  What daily rate does Watch Accuracy Meter give you if you check the Longines once it’s been running for 24 hours? Best Regards, Mark
    • Then, can I replace it by purchasing a regular ruby with the same or similar width and height and pivot groove size from eBay? If I replace it like the above and operate the movement, will there be no problem?
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