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Question about fragility of hairspring


Hi all.  I have a question about the fragility of hairsprings.  I’m completely new to watch repair, and have started by regulating my mechanical watches (Seiko 7S26 and Orient F6922 movements).  While adjusting the rate with a wooden dowel oriented parallel to the balance wheel, I have accidentally lightly grazed the hairspring.  It was enough pressure to stop the balance wheel, but there appear to be no negative consequences.  Both watches keep great time and have good positional accuracy.  And according to my timegrapher the beat error and amplitude were not affected.

So should I just chalk this up to good luck?  Or could there be lurking damage I’m not seeing?


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Hairsprings are very fragile. When you are working with them or around you need to be very careful, one tiny slip and it can be unrepairable. From what you have said I think you have got off lightly as the watch is still going and keeping good time.

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I think you got rather lucky! If the timegrapher is showing acceptable readings in all positions and visual inspection indicates all ok then I would leave it alone. From what you describe I would check that the spring is still in the flat - look from the side of the balance and see that the spring is not tilted in any way. 

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