sure Matt,
see:http://www.primitivearcher.com/smf/index.php/topic,36023.msg473512.html#msg473512
when i first posted these i was just starting with bronze, and they're great...though i haven't hunted with them.
the hole in the center allows the pitch to lock both sides covering the sinew.
i've experimented by putting a hole on either side (where a notch might be) it works ok....just harder to push wet sinew through small holes.
trying to avoid notches, edges that could snag hay.