The one thing you don't want is to have the arrow lying inside the centerline of the bow, which can be a problem with a micro-diameter arrow. Most BW's have a limb bolt mounted in the middle of the limb which you can use to center the string, or if it is one-piece, you can put a piece of white adhesive tape across the limb and mark the center. Hold the bow in front of you, and line up the string with the centerline of the bow with an arrow mounted on the string. Make sure the point of the arrow is outside the string. If it is not, build out the side plate with leather until it is.