i use that useless center shot tool to get me started. i would never trust my eye . im righty and with a whisker buscuit i always end up slightly left of center. im not technical or anything but i do feel that everyone should experiment with there set up because with so many variables between equipment and form the bottom line its where the arrow hits. i spent a couple hours moving my center shot around and formulated what works best for my bow. it was even kinda fun[:-]