Step 2: Preparing the cover
The only step where you would need some hand work is preparing the cover (if you want a cover). So, if you want a cover, disassemble your mechanical pencil, and use the plastic tube as a cover for your stylus. Cut the tube to a shorter size than of your bolt. Do not forget: the plastic cover should be much shorter than the bolt as you should be holding from the metal when sketching. After cutting the tube, put the bolt through the tube and fix it with a nut. We placed some more nut between the metal knob and the plastic cover, as I usually change holding position when sketching. If the plastic cover is much larger than the bolt, you can fix it by pushing paper or similar material between the bolt and the cover.