Here you can see the front servo tray support spacer. It stiffens up the servo tray. That is a TSK fuel tank, it fits perfectly and is slightly larger than 16 oz. The black tube that's ty-wrapped to the tray support houses the antenna wire. I also add a spacer under the tank near the frames. The tank is held in with double sided foam tape on the aluminum "L" brackets and a piece under the servo tray. I use soapy water on the tank & tape, slide it in, when the water dries it's there for the duration.