I have a Morgan 384 (sail number 39). I would like to know if anyone else with a 383 or 384 has experienced a mast vibration while tied to a dock. Whenever the wind is on the beam (at the dock) I have an intermittent low frequency (4-8 hz) vibration in the mast. The amplitude is not great, but still large enough to rattle the internal cables/halyards. I have randomly adjusted the tension in the stays in an attempt to reduce the vibration but this doesn't seem to have any effect. Does anyone have anything to offer about this problem?