Tricopter yaw mechanism for DT750 motors. My servo had a slight taper, so I did not add support for full length of the servo. I do not think this will be an issue, as the servo mounting ear fits snug in the base. Slots on the side of the servo, will hopefully keep the zip tie from coming off the end of the servo. Designed for 3/8" booms and to be mounted with zip ties. I used a 4-40 x 1.25" long screw for the hinge pin.