I would have figured that it would be the "arrow pass" when thinking about the geometry involved. Wouldn't you want the arrow in the exact center of the string if all was tuned correctly? That way, when the string makes the > shape of being drawn back, equal force both top and bottom would be exerted on the arrow. Then again, tiller adjustment would shift this some and since Hoyt bows seem to shoot well, it must work for them!

Interesting thought though. I'll have to measure my bow when I get home!