in my imagination i can see a padeye mounted horizontally on each side of the mast with a cam, clam, or other cleat under each padeye. the padeye would serve to keep the cunningham line from blowing away from the cleat if it became uncleated, so the cunningham could be adjusted from either side. figure eight knots on each end of the cunningham line would prevent the line from ecaping. i guess a cunnungham grommet and reinforcement would have to be added to the sail.