I replaced the reversing Y with a JR Matchbox. It took me a while to get the one Flap servo to reverse. I have never used a Matchbox before, but I could only get the servo reverse by setting the Flap switch to the Mid Flap position. The manual calls for the Transmitter stick to be at Neutral, when you press the button on the Matchbox to reverse the servo. I called Horizon, but they did not say anything about having the stick at Neutral. I tried pressing the button at full up flaps and nothing happened. I just happened to try it at Half Flap and it worked