Servo Saver
Oh and I just put a little Blue loctite on it.. was having that prob.. too.. seems to have solved but double nutting would work as well.... You could also try to find a O ring that will fit inside the bell of the retaining nut .. that would work as well not sure of size probly around 10mm if you dont have calipers and want to know I can find out.. O ring probly being the cleanest option and would still allow easy adjustmen..