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Because the 1/10 second mechanism exactly follows link the movement of the lower clutch system for the standard chronograph system, you need some protection there, too. Patek's achieved this by adding a shock-absorbing hook spring which, when the chrono is running, hooks into a matching hook link under the round plate on top of the column wheel. When the chronograph is switched off, the hook is lifted off the the safety hook under the column wheel top plate link and the lever is free to move.
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