Stuck mainspring barrel

Discussion in 'Watch Repair' started by RJSoftware, May 14, 2017.

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  1. RJSoftware

    RJSoftware Registered User

    Apr 15, 2005
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    Hello all.

    Bought an older Swiss cylinder escapement pocket watch for a couple few bucks. I had me some spending money.

    It was a bit of a rust bucket, but managed to get all screws out and parts cleaned up good. Hairspring was toast after ultrasonic dip. Cylinder has broken pivot. Broken balance jewel. Missing crown, stem and has broken glass.

    Still, I like it. It's even a bit on smallish size for ladies but it's the challenge you know.

    So, anyway, When disassembling I find the mainspring arbor wont release from the gear on other side (forgot name). It's the kind with two holes for tiny screws, but no screws. Not even sure why it's holding. I tried tapping it with a pointed punch when I got everything else out of the way. But no go.

    I took the barrel lid off and removed the spring and whole thing is apart now except the mainspring barrel, center wheel and winding wheel on opposite side.

    Basically, I could skip it and just reassemble with replacement parts or fixed and it would run. But, frustrating not to be able to remove the barrel.

    I am tempted to do a light grind across winding wheel to see if mainspring arbor has been flared out/peened or something. Probably rusted on but seems like more. It's not giving at all.

    Ideas appreciated.
    RJ
     
  2. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    That "screw"normally comes loose very easy! I usually loosen these with a pair of pointed pliers. I have come across one or two of these that were left threaded.

    Try to first run it in an ultrasonic cleaner and dry. Then heat it with a hair dryer and give it a new try.
     
  3. karlmansson

    karlmansson Registered User

    Apr 20, 2013
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    I Think you are talking past each other a Little bit. I Think RJ is saying that there are two holes for screws but there are no screws in them and I Think Skutt is saying that the holes are actually the "slot" that provides grip for turning a threaded part. That the whole thing is threaded on there. Can you post a Picture RJ?
     
  4. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    Possibly we are! This picture shows what I was referring to:

    [​IMG]

    Sorry if I misunderstood!
     
  5. karlmansson

    karlmansson Registered User

    Apr 20, 2013
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    That's what I thought you meant too! That is a nut though, it threads onto a threaded section on the barrel arbor.
     
  6. gmorse

    gmorse Registered User
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    Jan 7, 2011
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    Hi RJ,

    Yes, lay off the grinding and listen to our Swedish brethren! A small cheap pair of calipers can be ground to fit this nut if all else fails.

    It looks like a better quality Swiss cylinder with an endstone on the escape.

    Regards,

    Graham
     
  7. Skutt50

    Skutt50 Registered User

    Mar 14, 2008
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    Hi Graham,

    The picture is from one of my movements just to show what I was referring to in my earlier post.

    (This particular movement is one of those made to look fancy and on the casing, 23 jewels are mentioned. Unfortunately this is not backed up by the movement which has an end stone on the escape wheel but the pivot does not reach that deep........ and no end stone under the dial..... In reality the 23 jewels are more like 16-17......)
     
  8. RJSoftware

    RJSoftware Registered User

    Apr 15, 2005
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    Ah yes, thank you all much, my brothers from the others land. Although I have not tried it yet will give it a go. I hope I can find that compass I have with 2 needle points. Makes sense now.

    RJ
     
  9. GeneJockey

    GeneJockey Registered User
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    Mar 2, 2012
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    Tweezer tips, if you have a pair of BIG tweezers with fine tips.
     
  10. darrahg

    darrahg Registered User
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    Dec 22, 2006
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    I had a few round nuts that were stubborn getting off until I took an inexpensive screwdriver that had a working end as wide as the nut holes and ground down the center to form projections at the edges. This might not be very efficient unless you work on several movements with this type of nut or you are having difficulty using other tools.
     
  11. RJSoftware

    RJSoftware Registered User

    Apr 15, 2005
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    Turned left with pointy pair of needle nose. Worked like a charm.
    Thanks again!
    RJ
     
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