Concern about nock point being off 1/8th" isn't anal. 1/16th?...maybe, although I know shooters whose form is good enough they could tell. (definitely not mine!) Heck, I can get that much variance in the measurement from how much downward pressure I exert when I clamp the bow square on the string. If you use the narrow bar type like (Potawatomi) it's not as simple as it sounds when you use a thick rest like seal skin. I split a short length of arrow shaft length wise and taped it to the bottom of the square to make the arrow/shelf contact more repeatable. Maybe that makes me anal too.....Heh I resemble that remark!