A couple of quick strikes and the tension was relieved and the lower dent began to come out. The dolly can also be used as a small hammer behind the dent to help it along with several small blows. It's important to do this in order. If you try to pound out the dent from the back then move to the top and work out the high spot, the dent below will bulge. Always start with the peak to push metal back into the dent area.