Can I use this loop end mainspring without a rivet?

Discussion in 'Clock Repair' started by deena, Jun 9, 2013.

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  1. deena

    deena Registered User
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    I tried a new supplier for 30 hour mainsprings. When I went to use them I see the loop end is not riveted. Can I use it this way?
     

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  2. hookster

    hookster Registered User
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    Quite a few 30 hour movements had non riveted loop ends. I am a bit concerned, however, about how wide open the loop end is, and would want to re-shape it to be tighter. After doing that, you should be OK, as these springs do not have anywhere near the power of the 8 day ones.
     
  3. deena

    deena Registered User
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    Hookster thanks. I never saw one like this before. I can squeeze it together more once I have it over the post.
     
  4. hookster

    hookster Registered User
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    Yepp, that is what I would do.
     
  5. shutterbug

    shutterbug Moderator
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    You see that a lot in small clocks. They hold just fine.
     
  6. Kevin W.

    Kevin W. Registered User
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    My 30 hour Waterbury has the same thing, just squeezed the loop and its held.
     
  7. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    If you are uneasy about it being this way, you might cut a strip of scrap metal and form a band around the free end and the other part and squeeze the band tight to hold the tail from unwrapping.

    RC
     
  8. hookster

    hookster Registered User
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    Good idea RC, and I have actually seen this done on some 30 hour movements I have serviced.
     
  9. deena

    deena Registered User
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    Thank you everyone. I put them in without incident. So much easier to work with than 8 day springs.
     
  10. Kevin W.

    Kevin W. Registered User
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    Is yours in a cottage clock Deena.
     
  11. deena

    deena Registered User
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    Hi Kevin. Mine is an Iron Front. it is not real fancy, but I like it because of the painted design and mother of pearl inlay. It is a smaller clock, but I do not know the maker.
     

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  12. Kevin W.

    Kevin W. Registered User
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    Nice looking clock Deena.
     
  13. Phil G4SPZ

    Phil G4SPZ Phil
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    #13 Phil G4SPZ, Dec 7, 2019
    Last edited: Dec 7, 2019
    I came across this old thread after fitting a new strike spring to a very old Badische Uhrenfabrik cottage clock movement.

    I had been tempted to leave the loop end open, but whilst winding the spring on my Joe Collins-style spring winder, the loop opened up quite alarmingly. So I decided to rivet it.

    This was more straightforward than I’d anticipated. I clamped the loop end together using artery forceps, then centre-punched and drilled a 2.5mm hole through both thicknesses of the spring. I hacksawed a nominal 2mm diameter flat-headed brass rivet down to roughly 2.5mm in length, inserted it from the ‘inside’ and held it in place temporarily using a sliver of masking tape. Then I proceeded to tap the end of the rivet, held against the fixed vice jaw as an anvil, using light blows from a riveting hammer.

    The whole process took less than 15 minutes and the result is strong and looks reasonably neat.

    11AD684A-59CF-46C4-A353-DA16296B451A.jpeg E487B39A-3776-44A6-86DD-F51BB5842AF6.jpeg

    Phil
     

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