How To Make A Tennis Ball Cannon
How to put it together: 1. Using the first type of can opener, cut off the top and the bottom of the 6 large cans, so that each one ends up looking like a small tube with no top or bottom. 2. With the other type of can opener, take the small can and poke 6 holes in the top. The top will appear like a grill with those tiny triangleshaped holes.