-a piece of paper ( I teared it from a notebook )
-a ballpen ( something like the core also works )
Maybe you need something to cut the tape.
Step 3: Make the striker
Glue the tip.
Pull the pen core out.
Step 4: Make the barrel
Do not roll it too tight.
Glue the tip, too.
Make sure they can slide smoothly.
Step 5: Tape the rubberband on
Tape another tip of the rubberband on the barrel.
Step 6: Have fun!
I am going to make a auto refill one
Sorry for my poor English.