Mainspring repair?

Discussion in 'Clock Repair' started by Bill Cann, Aug 24, 2019.

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  1. Bill Cann

    Bill Cann Registered User
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    Mar 26, 2019
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    I encountered this prior "repair" while disassembling a recently acquired Sessions movement. At some point the mainspring had broken and it was riveted and brazed back together. The second image shows the joint had begun to fail. This looks like a safety issue to me. Was this common practice that I should watch for?

    Needless to say, a replacement will be ordered on Monday.

    IMG_1973.JPG IMG_1974.JPG
     
  2. wow

    wow Registered User
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    Jun 24, 2008
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    Looks bad to me. An accident waiting to happen. Definitely replace it.
     
  3. Uhralt

    Uhralt Registered User
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    Sep 4, 2008
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    Not common, but also not unheard of. Sometimes you find broken mainsprings that were repaired by folding the broken ends over and inserting them into each other. Compared to this, yours is a relative sophisticated repair but still a botch.

    Uhralt
     
  4. Bruce Alexander

    Bruce Alexander Registered User
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    Feb 22, 2010
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    Hello Bill,

    What Uhralt said...

    Here's a couple of other examples....

    Mended Mainspring: Use or Replace

    Interesting mainspring repair & Bushing question

    Heroic measures are sometimes acceptable when you're trying to save a brass mainspring. When you're looking at a regular steel mainspring I think it's a good idea to replace it with your "best guess" based on what you find already installed. Sometimes mainspring calculators can help guide you on what to order although they are based on barreled mainsprings.

    Sometimes you get lucky and find a match here: Clock Mainspring Chart

    Good luck with your restoration.

    Bruce
     
  5. Bill Cann

    Bill Cann Registered User
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    Mar 26, 2019
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    Ha! Some good examples of "repairs", will have to keep a look out. I completely understand necessity being the mother of invention, but I'm glad I didn't find duct tape.

    Thanks for the Mainspring Chart reference. Will have to keep a link to that.

    Bill
     
  6. shutterbug

    shutterbug Moderator
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    Oct 19, 2005
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    Brazing is strong enough to hold, but as inexpensive as springs are it seems a little odd to go through the trouble.
     
  7. Uhralt

    Uhralt Registered User
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    Sep 4, 2008
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    When I started repairing clocks as a teenager, I didn't even know that there are supply houses that sell clock-related stuff, like main springs. I repaired my parent's clocks with what I could find in the household and modify it to work.

    Uhralt
     

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