Now let's assemble the cam and pulley. Cut an oval shape out of a rigid material like cardboard or wood. Glue your triangular d-shaft attachment to one end. On the same side, but opposite end of the oval, cut a small hole. This hole is where we will attach the pulley. Your pulley can be a stick, a dowel, anything cylindrical that will allow a string to slide across it. We used a dowel, chipboard rings (to hold the string in place), a plastic bearing, and screw.
Want your puppet to move more? The distance between the dc motor shaft and your pulley determines the height your puppet will pop up and down. So if you want more movement, make your oval longer!