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  1. #1
    Registered user. Paul Raposo's Avatar
    Join Date
    Nov 2005
    Cambridge, ON Canada

    Default Why is this hairspring off center?

    A Tudor cal 59. I've had the the balance out of the movement and took the wheel and spring off the bridge.

    The spring was the correct shape on the balance wheel with the coils evenly spaced. When I put them back on the bridge the spring was still the right shape.

    When I installed the bridge back into the movement the spring bunches up on one side and is spread out on the opposite side. The spring is flat when in the movement and running.

    The pallet fork doesn't sit between the banking pins when the movement is not running, but is off to one side. It starts on the first turn of the crown and runs but loses about 70 to 100 seconds per day dial up.

    I hope these pictures give a clear view of the spring.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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