See a video here: https://youtu.be/osGeYBPDlS8
Please note: depending of some parts (rubber band) this toy can cause harm. Handle it with care and always with adult supervision.
Step 1: Cut a Squared Cardboard Piece and Some Sticks for a Solid Platform...
Step 2: Add the Vertical and Horizontal Top Sticks to Stop the Launcher
Step 3: Finish With the Launcher Stick and the Projectile Holder. You Have a New Fully Functional Catapult. Enjoy!
Add a long stick in each side from front to back to add stability when loading and shooting.