That is the whole problem if you turn it more then a half counter clock wise it will not close the valve. It used to work fine at 1 and quarter turn counter Just a week ago!!. That why I think the actuator has went bad .It not taking the force to close the valve.If I turn the spring anymore then a half it screw the running of the quad up, Either I lose top or midrange their is no in between at this moment . I can get the quad to run pretty good but cant fine tune it because of the actuator not working properly.