Trust me, you are wasting your time. A headache ball may break the top foot or so, but it won't break the bottom. Also, it will be dangerous for pieces of rock to be flying. I've hammered thousands and thousands of yds of rock. The only regret I ever made hammering, is using a machine that is too small.i have broke a little concrete and asphalt with a hammer, but never rock with any tool. i think a headache ball would be the cheapest.