Bennett actuators are strong but flexible nylon/fiberglass hydraulic cylinders. The piston-like arms push tabs into position. Fluid flows through a concealed hole in the upper hinge at the top of the actuator - thus eliminating external hoses subject to damage.
A1200SRC: Actuator Assembly - Small Version for M80/M120 (w/ Rivet Clearance on Lower Hinge)
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
Owner's Manual (pdf)