The actuator assembly is the piston-like strong arm that pushes the tab into position. The body of the actuator is made of a sophisticated plastic resin. The upper hinge is made of nylon. In actual use it bends approximately 5° but the upper hinge can bend significantly greater than conditions would ever demand. Hydraulic fluid flows into the actuator through a concealed hole in the upper hinge thus eliminating external hoses subject to damage by the elements. This actuator is flexible but hearty enough to withstand the demands of offshore use.