Hi again jase, when i put the trap door on my ultramag i set it so the arrow sits right across the burger button hole and i measures 3/4 from the riser to the center of the arrow and i had to make no adjustments, except for adjusting my sight a little bit, and i'am shooting 3inch groups out to 45 yards, if your not happy with the way the guy set it up for you just mount the rest straight, adjust the launcher arms for windage and elevation and reset your nock point, its very easy, and i'am sure you can do it yourself in no time, or if you like i can alway help you over the phone if you like.