A previous reviewer complained about small holes in the rubber. It's a dead sledgehammer, not a work of art, who cares, you hardly see them! As for the hammer, it's great with a lead shot in the middle, it transfers all the energy to the hit object with almost no rebound, it's almost like an instant double hit! However, I am a machinist and use it to force workpieces into vise jaws so they sit flat on the parallels. It works, but even with the whopping 4 pounds I have, you have to hit really…