how about this,,,,thread a piece of 4-40 rod into the screw hole in the sail servo and discard the horn/arm. glue the rod into place making sure not to get any glue in the servo itself. then thread a sleeve nut onto the rod 4-40 nut about an inch long. support the other end of the rod in a bearing or piece of brass tubing. the sleeve nut will need an arm across its width so it doesnt spin witht the rod. attach the ramp line to the arm on the sleeve nut and when your servo is activated it will rotate the rod which will spin inside the sleeve nut,since the arm wont allow the sleeve nut to rotate the nut will move up or down the length of the rod pulling the line,,,let me know if this sounds any good. this method only requires enough space for the servo and the thickness of what ever arm you use. the arm can be mounted in whatever position you need to accomidate the shape of the hull. thomas @ rmdesignworks