That's an interesting method. I usually just nock an arrow and pay attention to the angle it lays alongside the handle throughout the draw. For a right hand bow, if the arrow is only touching the handle at the front of the handle, I know the string is tracking left of the handle. If its only touching the extreme back of the handle, I know the string is tracking to the right. You have to figure in arrow pass variations, no cut out, centershot or what have you, but it works out pretty good for me anyway. Josh