The plane I'm building is the gp rv-4. The elevator is whats giving me the trouble. they are split and each half has a separate pushrod. they are linked together near the servo. They are fairly straight until they get into the last few bays. it kinda looks like a stretched out Y. I was also thinking of putting some graphite powder, or some other dry lube in there to help out. The elevators move freely, the problem is when they return to center. The servo stops moving while theres still a little tension on it, and begins to do that little vibrating flutter. I then have to move the servo horn by hand like a fraction of a milimeter. I just want to stop the flutter, any tips?