I have a 168.005 Cal. 561 at the watchmaker for service. As he was completing service, the rotor was rubbing the caseback. When I asked about the cause, in particular about whether the rotor pivot was loose, he answered with this explanation: "he case-back seems to thread a little deeper into the case-middle about .20 of a millimeter not allowing for proper clearance of the oscillating weight when case back is sufficiently torqued down. The correction was to use a larger O-ring gasket allowing the oscillating weight more clearance." Does that make sense as a diagnosis, and is the "fix" an acceptable one? I'd appreciate your thoughts.
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