A guy at a field I use to fly at , put a spring on the thro so it would spring to center. I for a time used it also ,worked very well you always knew where 0 pitch was. Now that I'm using a new radio (9zWC) I don't have the spring. I can't find 0 as easily but ,can still get the same result that I had with the spring it just takes practice. A notch would be helpful , I'd like to know how to put that in the 9Z radio.