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Halyard winch is held together not by the single top mounted flat-head screw, but by a C-clip that the screw and cap cover. To service the winch:
Rear winches are held together by a single top flat-head screw.
Port side winch is held to the mount by 4 flat head counter-sunk screws.
Starboard side winch is held to the mount by 1 counter sunk flat head screws and 3 counter sunk socket head cap screws (Allen wrench screws).