I would like to know the length of a jr 215 servo arm from center of mounting screw to outermost hole. The f90 manual says to use these arms with the pushrod connected to the outermost hole. I have a suspicion that this setup will give a bad mechanical advantage. I have Hobbico heavy duty arms and the provided clevises have slop in them due to the pin being smaller than the hole in than servo arm. After reading about all the failures, I've decided to sell mine before I fly it. I will also do all I can to make sure I have put my best effort into making it flyable.