[Rick TYler]

I don't have a drawing for you, but what we are doing with our one-wheel shooter is to vary the angle between the wheel and the pressure plate. The wheel is mounted on a live axle between two vertical posts. We built a simple U-shaped piece (but picture a square-bottomed "U") over the same live axle, with bearings holding the ends of the "U" over the same shaft that spins the wheels. By moving the "U" up and down we can vary the height of the shot. The ball shoots by the wheel squishing it against the pressure plate and then releasing it.

I think this is enough to get you going without doing all your design work for you. For instance, figuring out how to move the "U" back and forth is a nice little design project. Good luck.