after having read the two comments above. nothing seemed out of whack until i peeked under the flat blade spring holding the sweep second staff assembly. it looks like the pinion is too small and doesn't mesh right consistantly with the wheel that drives it. it doesn't miss a tooth, but it doesn't advance at a uniform rate. there's kind of extra space and it isn't always caught at the same moment, causing the second hand to go faster and slower, hesitating here and there, without ever really missing a beat. are the 21 and 22 pinions interchangeable? i couldn't figure it out from the manuals. i tried exchanging the staff assembly from other movements only to find out their lengths differ and can be too short or too long. thanks, tim
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