Actually I had the same question about bolt position,and marks.I was told the line you want should be in the center of the bolt.So from your pic you bow is set up on 6.5.So,you will have to shorten it up.That will make your let off feel non existent,but you will have to see how it feels when you draw it.Mine is set on 5.5.It called for 6,but the book says you can move it .5 to adjust to you.My bow is 30" 70# set for 80%.What is your length,and what let off are you wanting?You serving is still going to spread unless you put some serve tite on it or at the very least some type of glue.That's because of this super hard cam.Hope I helped.