Here is the video of the conveyor belt that Cynthia Hilmoe and I built with Legos for Mechanisms and Things that Move. We had a problem implementing the MinCD suggestion by the cartoon character in the instruction booklet, but that may be due to the fact that we had to use smaller rubber bands than the kit recommended because the recommended rubber bands were too stretched out due to wear to work. The instructions suggest replacing the wheel on the drive shaft of the mechanism with a smaller stud. After doing this, we were able to still use the crank to operate the conveyor belt, but it took a great deal more effort.
