On Tail Wheels I like to run the cable/rod thru an E-Z connector mounted on servo arm with a lite spring on each side and the a small collar to sandwich the spring between them and the E-Z connector. It prevents unwanted movement due to rough surfaces damaging the servo. You can make your own or get a kit from Great Planes: "GPMQ3890 Spring Over-Ride Servo Saver". It cost between $2 and $3 is all.