Here is the proper way to use this tool. Back off brake shoe linings. After it is secured to the hub and drum and tensioned, use a large hammer (not a sledge)and turn the crank head aprox 1/4 turn, then hit the center of the large bolt head once. repeat with increasing tension (1/4 turn aprox) and hit center of tool bolt head. Don't kill the tool but you will have to be hitting the head of it, that is how these were designed to be used.
Have fun.