MAKING A PROTOTYPE

First, we started out with small piece of wood that we cut a rectangle into about 1 1/2" down and 1" across on one end. Then, on one of the sides, we placed 4 eye hooks (2 on each end) and put axles through them. We placed stoppers on either side of the eye hooks to stop the axle from moving back and forth, and then attached the CD wheels to the ends of the axles also using stoppers.