I just purchased a 1976 O'day 25 and have a question or two: First, I noted a 1/8" cable that parallels the back stay. Any idea what that might be for? Second, with an inboard disconnected, how easy should the prop shaft turn? and finally...for now, there appears to be tracks on the cockpit combings. Are these Genoa tracks? They seem far back for that. Thanks - Keijo