My home has a granite lined cove about 35' across which goes to mud flats at low tied. I want to keep an 18' motor boat tied/moored between the sides of the cove such that I can pull it to shore when I want to use it, like a clothes line. There are already eye screws in the ledge and I imagine I need to add a pulley somewhere. Should I also add a mooring in the cove? Should the boat be parallel or perpendicular to the shore? Has anyone done this or have a pointer to a schematic of what I should hook up where? Thanks, Rich.