Seems like a cool science project for the kiddo!
Toys from Trash
Juguetes Científicos: Muñeco Equilibrista - experCiencia
Making a DIY catapult using recycled materials
Balancing stick man. need popsicle sticks, old pen with slick groove in clicker end, 2 bottle caps, 4 nuts same size for weights and an old cd.
Image titled Make Boilies Step 7