We would like to bring a fifth line back to the cockpit on the starboard side of our 1991 Legend 37.5. While I do not beleive adding a fifth position to the rope clutches will be a problem, I do not know whether the same is true of the line organizers. The boat is 280 miles away and I need to do some planning. Has anyone ever added a fifth sheave to the factory line organizer? How was this done? Like other hardware, is the line organizer screwed into an aluminum plate embedded in the deck?