Much thanks to all.  This has been very helpful.  I was actually asking about arrow pass location I just didn't know the term and probably didn't phrase the question properly.  Aaron and others nailed it for me.  I also had wondered about the nocking point above (or below) perpendicular to the arrow pass and you've answered that handsomely as well.  And now I have a new term I can use.  

  Thanks again to all.  I do enjoy this forum.