vibrating main mast spreaders on SM

John Clark

Hi All,
    on an easy sail (AWA 70deg, AWS 17kts, STW 7.5kts, 1.2m waves) I noted the main mast lower spreaders on both sides vibrating fore and aft..  Not enough to feel in the cockpit but obvious when looking at them    I made a super minor change in the sails and the vibration disappeared.    In six years and 12k nm I have not seen this before.   Has anyone else observed this rig behavior?

Regards,  John
SV Annie  SM 37
St Croix USVI

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