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I need a hairspring

NC Plumber

Registered User
Jan 15, 2011
413
22
18
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for a 18 size 21 jewel Hamilton, grade 940.
 

Kevin W.

NAWCC Member
Apr 11, 2002
23,272
586
113
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Nepean, Ontario, Canada
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Region
You can change a hair spring, but the time keeping will be off.Better to have the hair spring vibrated to suit the balance.
 

finiteguy

Registered User
Oct 28, 2003
510
2
18
What does vibrating do for the hair spring. Does it harden it by strain hardening?
 

NC Plumber

Registered User
Jan 15, 2011
413
22
18
Country
Actually vibrating a hairspring refers to locating the correct spot for the hairspring stud. If its a little too long the watch will run slow, too short makes it runs fast. Theres a tool made specifically for this task.
 

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