The bow shop I go to tried one of those and it won' t work on my bow. He said there isn' t a flat area where the tool attaches in order to make it work. I tried one myself before and it had the rest about a 1/4 inch left of center. When it was set before by a shop the arrow wasn' t set dead center through the middle of the limbs if you looked down the limbs and tried to eyeball it, it was more to the right. I' m going to have to go back to the shop and talk to him some more.