THIS WORKS LIKE A CHAMP ON THE 049-051 COX DAVIS HEAD
PROCEDURE REMOVE THE SPRING UNDER THE COMPRESSION SCREW, ATTACH SERVO ARM TO TOP OF THUMB SCREW CAN BE TURNED BY 1/4 1/3 TURN BY A SMALL SERVO VERY LITTLE LOAD ON SCREW ENGINE SLOWS ENOUGH TO LAND NO RC CARB NEEDED MARTIN
WORKS OF COURSE BY LOWERING COMPRESSION MARTIN