Thread: Balance hairspring replacement process -- newbie needs info

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  1. #1
    JAA
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    Balance hairspring replacement process -- newbie needs info

    Background. I have been working on watches only for about a month. Can disassemble and clean a simple manual watch.

    I'm trying to fix an automatic watch that was running too fast (by 1+ hour per day). I believe the root cause was a tangled hairspring. I removed the balance assembly and removed the balance wheel from the bridge.

    The hairspring was no longer flat and hopelessly tangled. I'm afraid the hairspring is not repairable.

    The watch dial is marked "Zaigor". No specific label that would help me to identify the movement.

    I hate to retire an entire movement due to a messed up hairspring.

    I think I'd have to go to watch school in order to learn how to vibrate a new spring...at this point I think the best case scenario is for me to do a complete balance wheel assembly replacement.

    How do I go about identifying and finding a replacement? Options?

  2. #2
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    Re: Balance hairspring replacement process -- newbie needs info

    If you post some clear close up pictures of the movement, especially the dial side with dial removed, we can probably help you identify the maker. Then it would be a simple matter of getting another used movement and replacing the complete balance and hairspring. Depending on the movement, it might even be possible to order a new replacement.

  3. #3
    JAA
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    Re: Balance hairspring replacement process -- newbie needs info

    Here are two pictures.

    I poked around and found this marking on the back side of the base plate, covered by the automatic winding mechanism:

    ETA symbol with the letter "F" in the middle, number: "4007N"
    Attached Images Attached Images   

  4. #4
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    Re: Balance hairspring replacement process -- newbie needs info

    You have a Felsa 4007N. Balance assembly complete (which includes roller table and hair spring) is available from Cousins in the UK.

  5. #5
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    Re: Balance hairspring replacement process -- newbie needs info

    Jules Borel here in the U.S. also stocks the balance. There are 2 balances available- you need the shock-protected variety. Dashto.org has many used movements for sale. All these movements share the same balance assembly (this is from the Jules Borel website): If you buy a used movement, be sure it is listed as "shock", also be aware that bs in the dashto listing means the watch has a broken balance staff.
    ELG 813 AUTOMATIC SWEEP SECOND
    ELG 854 AUTOMATIC CALENDAR SWEEP SECOND
    ELG 885 AUTOMATIC-CALENDAR-SWEEP SECOND
    FEL 4000 AUTOMATIC SWEEP SECOND
    FEL 4000N AUTOMATIC SWEEP SECOND
    FEL 4002 CALENDAR-AUTOMATIC-SWEEP-SECOND
    FEL 4002N CALENDAR AUTOMATIC SWEEP SECOND
    FEL 4004 AUTOMATIC SWEEP SECOND CALENDAR
    FEL 4005 AUTOMATIC
    FEL 4005N AUTOMATIC
    FEL 4006 CALENDAR AUTOMATIC SWEEP SECOND
    FEL 4006N AUTOMATIC SWEEP SECOND CALENDAR
    FEL 4007 AUTOMATIC-CALDENDAR-SWEEP SECOND
    FEL 4007N SW. SEC.-AUTO.-CALENDAR
    FEL 4008 AUTOMATIC CALENDAR SWEEP SECOND
    FEL 4009 SW. SEC. AUTO CALENDAR
    FEL 4010 SWEEP SECOND
    FEL 4010N SWEEP SECOND
    FEL 4012 CALENDAR SWEEP SECOND
    FEL 4014 SWEEP SECOND CALENDAR
    FEL 4015
    FEL 4015N
    FEL 4017 CALENDAR-SWEEP SECOND
    FEL 4017N SWEEP SECOND-CALENDAR
    FEL 4018 CALENDAR SWEEP SECOND DAY DATE
    FEL 4019 CAL 18000 BPH
    FEL 4019A SWEEP SECOND CALENDAR
    FEL 4031 SW. SEC AUTO CAL
    FEL 4032 SW. SEC CAL.
    FEL 4033 SW SEC AUTO CAN DAY-DATE
    FEL 4034 SW. SEC. CAL DAY-DATE
    GRU 522CD MECHANICAL MVMT
    GRU 580CD ITJL MONOREX DSS AUTO CALD DATE AND DATE
    GRU 580SS AUT SS
    MST 441 CALENDAR-AUTOMATIC-S
    Last edited by clock40man; December 10th, 2011 at 14:27.

  6. #6
    JAA
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    Re: Balance hairspring replacement process -- newbie needs info

    Thank you all for your quick help. I was saying "$%&@#$!, what am I going to do now". This is helping me to learn about movements, parts, materials.

    Now I just need to keep working on the skills.

  7. #7
    JAA
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    Re: Balance hairspring replacement process -- newbie needs info

    ...ok. One more newbie question: when I go buy this new balance, it does come with the stud already installed at the end of the hairspring, right?

  8. #8
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    Re: Balance hairspring replacement process -- newbie needs info

    well you will need skills as you say to change balance and not just skills but also some tools.

    i sugest better take it to a watchmaker or wait few more months(years) before you try to do it yourself
    i dont want to be rude just helpfull i hope

  9. #9
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    Re: Balance hairspring replacement process -- newbie needs info

    Yes, the stud will be installed. You will need to be careful, and a good set of screwdrivers is important, but if you'd like help doing this yourself (and understand the risks), I (and I suspect some others) would love to talk you through it.

  10. #10
    JAA
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    Re: Balance hairspring replacement process -- newbie needs info

    Thanks for the inputs. I can practice with the bad hairspring until the new one arrives. There's a video on YouTube by "Bunnspecial" on how to do this. I also have the books by Fletcher and Fried. If anyone here can give additional tips, it would be very much appreciated.

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