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February 14, 2013 at 10:35 am
#52471
Sometimes the collet is closed over the hairspring, it is almost riveted over it, if you can get the old hair spring out and clean the groove enough to get the new hairspring in then the rest is easy. Just make a note of which way round the hairspring comes out of the collet, i.e. do the coils exit from the left or the right of the slot.
Good luck
Paul.