When you draw your bow with a loop your release actually pulls slightly above the center of the arrow.

It is best to use use some serving material and tie a nock below your arrow about 3/16" long and one above your arrow about 1/16" long and install the loop outside these tied in nock sets.

This will center the loop below center of your arrow but when you come to full drawyour release will centerdirectly behind the arrow and also keeps the loop from pinching the arrows nock at full drawmaking a cleaner release from the string.



A brass nock doesn't do anything except add weight to the string and slow down your bow. A properly tied and tightenedstring loop will not slide up the serving unless your string is served with monofilament serving material.

In the pic it looks like the arrow isn't square with the loop but this is only because there isn't a rest on this bow so the arrow is resting onthe shelf. But you can see how the release pulls above center of the loop at full draw.