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Zenith movement 16520 and 16523 hacking seconds
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13 November 2022, 05:28 AM
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mikeo1
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Join Date: Feb 2011
Location: california
Posts: 34
The momentary backward movement of the sweep second had is related to the tightness (slippage) of the cannon pinion; backwards one is a bit tight or not as well lubed -- not a big deal
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