I can understand the thinking, I just haven't read anything about it on any of the Hitec sites and really would like to see what they have to say about it. I know that the Sukhoi at idle and on the ground really shook the tail feathers and it had crossed my mind more then once, never had a problem though. I may have just gotten lucky?? If you look you can see how close I had both the elevator servos mounted to the elevator halfs and I used short 4-40 control rods. The Extra doesn't vibrate much at all?? Surprised me!! The 6985s work outstanding on it too. I found a close out once on the 6985s at Servo City and bought up a big pile of them, very good servos!! Talk about a deal!!!