This is a pea shooter we made as kids. Eye protection recommended if used in battle.
Step 4: Disassemble the pen
The plug on the bottom doesn't pop out like the use to, it was rather tricky getting it out. You need to keep the end intact
Step 5: Create the air chamber
Press the tube into the peel so a piece of the peel is stuffed tight into the end.
Step 6: Setting the plunge trigger
With the ink cartridge push the peel to the narrow end of the tube.
Step 8: Ready to launch
Now cover the tiny hole on the side of the pen tube with your finger so that you will create an air chamber.