RE: bow squares
line up the bottom edge of the square with the center of the Berger button hole this will indicate to you where the center of the nock is located on the string but In my experience you should never set the nocking point square with the bow due to the fact that nock travel is not level or strait
you will get your best results being roughly 1/8" above center with most rigs but the square will give you a reference point.