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Patek Philippe

the lever is to let down the power from the mainspring on disassembly by disengaging the click from the teeth around the barrel

 

the lever has to be moved by a screwdriver -upward-while holding the crown in your finger and thumb to gently let down the power of the mainspring for a complete service.
the mess of the hole is caused by the moving of the screwdriver in the hole.

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