May get howl about this suggestion BUT
If you can remove the mechanism from the housing or at least gain access to it
In a ventilated room dampen a cotton bud with lighter fuel and very carefully wipe the places that the cog wheels fit into the front and back plates. As soon as cotton bud gets dirty use a new one. Once cleaned get some clock oil and put minuscule amounts on the spindles you have cleaned.
Not the professional way but it has worked for me! If your not happy with the idea don’t try it
Maurice
February 2011
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