Bennett A-1103 Actuator Upper Hinge Replacement actuator upper hinge for Bennett Marine trim tab actuators. How to Replace an Actuator Upper Hinge With trim tabs in full up position, locate the trim tab hydraulic line inside the transom. Detach the tubing from brass elbow. Note Some oil will drip out. While holding pipe nipple with vise grips, unscrew brass elbow. Outside the transom, snap white plastic clip on shaft protruding from the bottom of the cylinder. Grab the body of the cylinder with