I have a Zephyr II that I am unable to fly due to the servos jittering. I have read several articles about moving the down link transmitter, but it would be difficult to do as I have cut the transmitter into the wing. Another suggestion was to use an opto coupler, however I haven't been able to get one from the Diy store or anywhere else. Does anyone know where that I could purchase one? If not is there another fix?