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August 18, 2013 at 11:16 am
#53932
Tom is correct, the only reason for this would be either the inner or outer end of the mainspring is damaged and is no longer catching although it will take a very small amount of winding before slipping. If you intend to take the mainsprings out please make sure you wear gloves and safety goggles, they can bite!
Paul.
UPDATE!!! – It has just been pointed out to me by someone who is quite clever, that it looks like there is a wheel missing? Was this taken out for the picture? If there is a wheel missing there is nothing to stop the barrel turning?
Paul.