Elgin #18 Hairspring collet seems lose on staff

Home Forums General Discussion Forum Elgin #18 Hairspring collet seems lose on staff

  • This topic is empty.
Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • #48329
    wingman
    Participant
    • Topics Started: 34
    • Total Posts: 91

    I just replaced the staff on an Elgin pocket watch. I noticed that I can easily rotate the hairspring collet around the balance staff by placing a small screw driver in the split part of the collet and turning. Is this normal? Is there a way to tighten a hairspring collet.

    #52060
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1553

    Hi Steve,
    It’s common to have to close the collet a little bit. The dimension of the new staff may have been a tiny bit undersized. The best way to close it would be with one of the tools that Bergeon offers but they are incredibly expensive. I do it on my staking set and it only takes a minute. You can use a concave punch (tapered inside) and a flat stump. You would need to remove the hairspring collet from the staff and place it on the stump in your staking set and then choose a punch that just reaches the full diameter of the collet. This part is critical because if it is too large it may make contact with the hairspring and distort or damage it (it can’t touch the hairspring!). You can then tap it lightly and check the fit repeating the process until you’re happy with it. Also if the hairspring isn’t pinned at the center of the collet then put the punch on the side of the collet furthest from hairspring.

    Hope this helps Steve,
    Bob

    #52061
    wingman
    Participant
    • Topics Started: 34
    • Total Posts: 91

    Thanks Bob I’ll give this a try.

    Steve

    #52062
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1553

    You’re welcome Steve,
    Let us know how it works out.

    Bob

    #52063
    wingman
    Participant
    • Topics Started: 34
    • Total Posts: 91

    Thanks Bob

    Your suggestion worked beautifully. I was able to gently compress the collet with an inverted concaved staking punch. The hairspring collet fits snuggly on the staff now.
    Such a wonderful sense of accomplishment when you bring an old watch back to life. I don’t know what we would do without your guidance. Thanks again.

    Steve

    #52064
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1553

    You’re welcome Steve,
    Very happy to hear it worked out well for you.
    Thanks for the follow up!

    Bob

Viewing 6 posts - 1 through 6 (of 6 total)
  • You must be logged in to reply to this topic.
wingmanElgin #18 Hairspring collet seems lose on staff