Think of it this way. When your looking at the picture you posted, the left side of the sight pin housing is against the threaded piece (the bar that extends out as you described it above). When you move it to the other side, the right side of the sight pin housing is against the threaded piece. Therefore you aremoving it the thickness of both pieces which equals 8 ''tick'' marks and since there is only 8 ticks of adjustment we end up with theexact oppositeproblem on the other side.