RE: How high above square?
You can nock an arrow at 90degrees to the bowstring with an even tillered bow, and raise or lower the attitude in which the arrow leaves the bow by adjusting the tiller of the bow instead of your nocking point. A severely high or severely low nocking point can be adjusted for by makingan adjustment to tiller on the bow. An arrow that is nocked real high on the bowstring will require extra tiller on the lower limb of the bow. An arrow that is nocked below 90degrees on the bowstring will require extra tiller on the upper limb in order to leave the bow in a level fashion.
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