Ok so I have a question about how to use these things. I have had one in my box for YEARS but have never used it. I usually just "eyeball" level for my nock point. It has worked for a long time but I was just curious on how do you "actually" use the thing? It has 1/8" increments on it from 1/4" to 0" I assume the arrow nock goes on the 0's markings and the brass nock goes just above that then you would bring you arrow rest "valley" up to it and all in all it should all be level, correct??