Don't worry about the 4rth,unless the 3rd is off.regardless if it is a hunting bow or target bow.


3rd has to be square with the arrow to be accurate.Most people use the bar to set the 3rd axis,not the arrow.


Go to the link I posted and read up on how they tell you to set the level,then it should come together in your mind.


4rth just aligns the arrow with the bar,making setting the 3rd to the bar accurate.