That 1/2" is from above the shelf. Your draw style will also have an impact
on where you set your nocking point, typically lower for three fingers
under. Remember not to crimp your nock set on to tight to allow for tuning.
I have this bow square and my nocking point is 1/8" above the line that
would represent the top of the arrow. I hope this helps.
Answered on 2/21/2013
Yankee Longbow from W. Greenwich, RI