Step 1: The Materials
1. Button-top Highlighter
2. A Knife. (or Multi-Tool as pictured)
3. Something long and skinny. (5mm Hex)
4. Aluminum Foil
5. Electrical Tape (Making tape for instructional purposes) (optional)
Step 2: Removing the Guts
Now, there are still more guts in there. You just have to get them out. I found that the best way is to just poke them out the bottom. It's the easiest way. Go outside or over a sink and use some force to push the guts and bottom plug. Ink may or may not go everywhere. Be sure to wash your casing with light soap and water.