Hello Folks! The Sliding tray, (for servo trays that held servos) was the only way we could fly airplanes with elevons, back in the day. Eventually, while I worked at Kraft, the engineers came up with a mixer, which I installed in my transmitter. It was a big thing, then because I could eliminate the sliding trays! Today it is a minor software adjustment, but this reliable sliding tray system works very well and may be something you could use yourself someday. Thanks for watching and happy flying. God Bless.
Dave