butch, it works like the rear sight on a rifle, the rear sight must be centered as well as the front. then when your eyeis aligned with both you have your lay. unless of course the top isnt centered with the butt.
you need 2 points of reference to be accurate. basicly put each stick in each corner, lay another stick across the top of the two, fin the center of that stick and line that point up with the crossing point of the first 2 sticks. clear as mud?
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