This is the result of watching and amalgamating, all the youTube videos on compound bows, hundreds of them, some good, some shite, during the Lvl 4, and 3 lockdowns.
The idea behind the spirit levels, is to ascertain that the arrow is at right angles to the string, so using a 90º square, is good, but levels confirm. The arrow (so I'm led to believe) is best to be, situated across the Berger button hole and horizontal, if the bow's axis is vertical.
If it's higher than the Berger button hole, it'll be less accurate, and lower, the fletching will contact the shelf.
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