U.S. Watch Co. (Waltham) replacement hairspring

Discussion in 'Watch Repair' started by RyanM, Jun 3, 2019.

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  1. RyanM

    RyanM Registered User
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    Feb 27, 2019
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    I have a size 0 Unites States Watch Co. of Waltham that came to me with a pretty terribly bent (sharp bends in multiple locations) hairspring and am having trouble discerning what kind of replacement hairspring to get for it. Ideally I'd like to learn how to find the information myself rather than have to ask around every time I have a similar issue. I know there is a materials book for the more common manufacturers, and my copy is being delivered, but I do not believe this manufacturer is included.

    Any information would be appreciated, thanks!
     
  2. Albert Antonelli

    Albert Antonelli Registered User
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    Ryan, is it possible that u can straighten the hairspring I know this is a tricky thing to do but, to get a new or in good shape hairspring to fit your balance, I’m sure u know if u find a hairspring it still needs to be vibrated to your balance wheel. My two cents worth good luck.
     
  3. Dave Coatsworth

    Dave Coatsworth Forums Administrator
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    Feb 11, 2005
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    If he gets a correct factory hairspring that is colleted and studded, it will have already been vibrated.
     
  4. RyanM

    RyanM Registered User
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    Feb 27, 2019
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    I could try, and probably will, but I'll also have a backup plan just in case. I've seen people suggest using sewing machine needles with the tip cut or filed off so that the slot is open to work with hairsprings. It will at least be good practice. It is in pretty rough shape, though.
     
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  5. Tim Fitzgerald

    Tim Fitzgerald Registered User
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    It's a very frustrating job, straightening a hair spring. But it is very rewarding when you get it right. I have never heard of the sewing needle tool. Thanks
     
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  6. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    Could you post a picture? It is much easier to discuss things when you see what they look like.

    It is preeey straight forward. Find the smallest sewing needle you can and file off the tip of the eye. You then have a small fork that fits nicely over the hairspring. Fit it to a small handle and you have a useful tool for manipulating bent hairsprings. I used them a lot in the past but have more recently moved back to tweezers. I still use the needle tools specially if one needs to make a "sharp" bend type adjustment.
     
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  7. Tim Fitzgerald

    Tim Fitzgerald Registered User
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    Thanks
     
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  8. D.th.munroe

    D.th.munroe Registered User

    Feb 15, 2018
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    I think in deCarle's Practical Watch Repairing, he has a sewing needle tool but I think he only uses it to break of the center or outer end of new springs. Also sewing machine needles are handy for this and some other things.
    Dan
     
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  9. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    I never tried that. My problem when searching for needels to use was to find needles with small enough eyes. Most needles I found were too big. Last time i found a set of needles where only the two smalest were what I was looking for.
     
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  10. RyanM

    RyanM Registered User
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    Feb 27, 2019
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    Here is a pic of the hairspring.

    20190612_151919.jpg
     
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  11. kevin h

    kevin h Registered User

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    ohhh dear .....
     
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  12. Tim Fitzgerald

    Tim Fitzgerald Registered User
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    My that is a mess. Good luck.
     
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  13. RyanM

    RyanM Registered User
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    Feb 27, 2019
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    And here is a pic of that watch's hairspring now.

    20190612_174618.jpg

    Thank you @Dave Coatsworth for getting me the replacement.

    20190612_174958.jpg
     
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  14. Skutt50

    Skutt50 Registered User

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    I fully understand why you wanted to replace it. The old hairspring can probably be saved and made into a working condition but with all those kinks and bends it will not be unvisable and the effort is way too time consuming.

    Congratulations on finding a replacement!
     
    RyanM likes this.
  15. praezis

    praezis Registered User

    Feb 11, 2008
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    Is your watch running again and how?

    Usually a marriage of balance wheel and hairspring of same calibre but from different sources does not work. I wonder if this is different with American PW.

    Frank
     
  16. Tim Fitzgerald

    Tim Fitzgerald Registered User
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    Glad you got your spring. Dave has saved my bacon on many occasions!
     
  17. RyanM

    RyanM Registered User
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    Feb 27, 2019
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    I have a few other watches to get to before this one, I'd just put the hairspring on to test, but while installing a bench lamp, a rain of dust fell directly on the movement, so I have to clean it again. I'll get to it this weekend and let people know how it goes.
     

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