Hello Everyone. I've made all the parts of a mechanical pencil. The parts include the eraser, the body, the spring, the inner tube, the lead and a few other parts that seem pretty insignificant. With all these parts, does anyone know how to make a working pencil. What mates or animations are necessary to allow lead to come out when the side with the eraser is pressed. I would vastly appreciate it if someone gave me step by step instructions in making this a reality. Thank you.