What happens next?

How to make a high powered pen gun
Remove the ink cartridge and end of the pen.
( hold onto the ink cartridge )
Cut the writing end of the pen off.
( it makes it easier to fire.

Options are: --) Cut the elastic band in half so it becomes one strand. Then put a dot in the center of the elastic band strand.; --) leave the cartridge behind if you take care of it later. Attach a large teaspoon of hot glue to one end of the pen.; --) once you have cut it it is too big. To remove it, squeeze the writing end just long enough.; --) Tie your sharpie, ink feeder, glue gun together. Tape it closed with duct tape if you like.;
) Cut the elastic band in half so it becomes one strand. Then put a dot in the center of the elastic band strand.