I have the G5 expert II which is the same thing. You adjust the tension by either tightening of loosening the screw where the launcher arm comes out of the mounting arm on the arrow side of the rest, and once you get the tension where you want it there should be a small allen screw on the other side of the rest that will tighten it in place. Hope this helps, if you need anything else let me know and all go grab my bow so I can actualy see it and maybe explain it a little better.