John got underneath the trailer to see what he could do. He found that the only thing he could access was the bolt holding the keel. So he loosened it 3 turns.
Then we went off sailing up to the bridge to see if this slight adjustment had made any difference. It had. The hum was almost, but not quite, gone.
However, next day when we went out the hum was back - not as bad as the previous weekend but much more than when I went out with John.
Andrew the shipwright told me that he had cut the new winch wire long enough so that the keel was fully down when there were 3 turns left on the drum. It seems that the hum is much reduced if I keep winding so that there are no turns left on the drum. The problem really is irritating. Just when one wants to enjoy the pleasant sound of lapping water there is this tiresome hum.
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