Coin Trebuchet/Catapult

This is a trebuchet a friend and I reverse engineered for class. It uses nickels or pennies as a counterweight. All part stls are there separately and individually.

here is the animation link:

https://youtu.be/dj7LCo3iNwY

here is my friend's account:

https://www.thingiverse.com/adadadadad/about