Stark who was late due to the mun being sickly considered the assignment. This could be fun.

After some digging around, he found a short length of PVC pipe that was big enough to allow tennis balls to roll through it. A spring attached to a metal plate cut to size worked for the firing mechanism. Pull on the spring, it snaps back, and the ball goes flying. Not very far, but it at least clears the pipe every time.