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Open loop mainspring "Click" to Login or Register 
Hi All,
Could anyone describe for me the correct method of installing an "open loop" mainspring. (If it is different from a normal loop end

Posts: 12 | Location: Newcastle, NSW, Australia | Registered: December 25, 2006
Picture of Greg Reeves
It still should just slip over the post as a normal loop end would. Having said that...there have been occasions(an alarm clock), where I started the tongue over the post, and when the plates were secured after assymbly...that I then wound the mainspring and the tongue and loop would then slip over the post to the correct position.

Posts: 497 | Location: Genoa, New York U.S.A. | Registered: November 06, 2003
The real benefit of the open loop is that it sometimes (not always) can be wound directly onto the arbor without having to strip down the movement.

I find the hardeat job can be trying to get the broke spring out.....without stripping down the clock.
Posts: 264 | Location: Westbrook, United Kingdom | Registered: June 15, 2007
Thanks for the helpful replys to all
Posts: 12 | Location: Newcastle, NSW, Australia | Registered: December 25, 2006
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