If you adjust 3rd axis off the bow or adjust it to your sight bar.You will need to check the 4rth axis.This basiaclly is checking to see if your sight bar runs parralel with the arrow.If it doesn't,the bubble will still lie to youa little.


The sight should beperfectly perpendicular to the arrow,this iswhat we are trying to achieve.If you set the 3rd off the bow,this is impossible to do.In this case,go out and slide the bar forward all the way.Shoot a group into thetarget.Then move the sight bar out all the way and shoot another group.If thegroup is in the same relation left and right,you are fine but if they are not,you will need to shim the sight bar to where both groups hit the same.(This is where you may find that some risers are not square to centershot)Then it doesn't matter whereor how you set the 3rd axis.


This is splitting hairs when talking about a hunting bow that has an average shot of 17 yards.When you are talking about a target bow and want to hit a 1" dot at 40 yards and shooting at a 30 deg downhill angle,it will affect impact point.