I tune in a very simple fashion. I shoot into a block target (or something similar). I get 2 broadhead arrows, and 2 field point arrows. I shoot the field points into the bull, then shoot the broadheads.. I correct the rest (in/out, up/down) to get the broadheads and fieldpoints hitting in the same spot. If you mess with it enough, it will be perfect. Out of the 8 bows I've owned, after doing this, I've gotten bullet holes through paper 100% of the time.