I recently had a cross country flight and searched for a way to hold my cell phone up to watch movies on it without having to use my hands. There were several options available to purchase, such as a spring loaded clip on and a foam covered aluminum sheet. I actually bought the clip on and it was not as stable as I'd like. I then realized I could convert a standard in car vent holder to work with a simple piece of bent aluminum from the hardware store. So I returned the clip on mount and made my own adapter. It's 3/32" x 3/4" aluminum strap about 4 3/4" long. Short bend at 1" and long at about 2". Leaves about 2.5" to tuck behind the tray.