About this 3D model

This is a fully working model of a trebuchet that I made for a school project. To make the sling and pouch I used craft string and a gauze pad. This trebuchet throws a little eraser roughly 5 1/2 ft. with 1 pound or so in the counterweight basket. The only thing needed is a small nail about 1/8 inches long in the top of the arm to hold the top of the string leading to the pouch.