catapult

This is a heavy-duty catapult I designed specifically to launch marbles and/or bouncy balls. The hinge I made with the help of a youtube tutorial on hinges and fusion 360. The little holes on the base of the catapult are used to hold down the "arm" with something the diameter of a toothpick (2 mm). I have tested with up to six doubled up rubber bands, and that really gives that bouncy ball a boost, (I didn't try the marble with so many rubber bands, though it should work just fine).