First, we are going to learn about the servo motors that come in the lego mindstorms NXT kit. These are our main tools because they will generate power. We can test this by first connecting a motor to another motor with one of the cables included in the kit. As you spin on of the motors, you can see that the other one spins too, showing that the motor is generating power. This is very basic, but it plays a big role in the final product.
***The second picture shows how to build the crank I used throughout my Instructable, it works very well but it helps to superglue the pieces together as legos can fall apart easily.