Step 1: Supplies
For this project you will need a Pilot G-2 07 pen (or one with corresponding parts) and some scissors.
Step 2: Dissemble the Pen
Now that you have your supplies, unscrew the cap part and take out the ink thingie, the spring and the click mechanism.
Step 3: Cut the Cap
For this, you will take the cap of the pen that you unscrewed from the base and cut it in half using your scissors (easier than it seems)
Step 4: Reassemble the Pen (In Rocket Form)
First insert the top part of the click mechanism (the part you would touch to click it. This time, we will insert the spring and the other part of the mechanism afterwards. Screw the cap that we cut in half on now.
Step 5: Done!
To use it, use the ink tube thing to push the mechanism and spring until it stays. Then insert the thing that you want to fire and press the mechanism! Fire!