Not a scolding, Mike, but I am very familiar with Jon Poole's Truth Tool. I was in Vegas at the Riviera when he introduced it to the American market. It is identical in use to the Manson tool. The Manson tool is zeroed while out of the barrel, holding the "ball" in one hand and the loop in the other. If you want to hang the Manson by the thumb, you can do it. You can put a block with a 1 1/2" hole in it or use a rope loop, like I do. The result is the same.