I seen them shatter the edge off hitting the lip, I never do that. I hit the front flat and I hit the sides as if trying to strike the brake shoe material itself. I hit at 12, 3, 6, and 9. I hit between the studs (With nuts on to prevent replacing studs while I am screwing things up!). I hit, and I hit, and I hit for hours.....Uprooting shrubs, trees, and flowers! I pound, and I pound, and I pound some more......breaking tools, bones, and denting the trucks door!
You should always win this battle, but it can be an adventure once in a while!
PS. I should keep my day job, A poet I will never be! I tried!