Abstract: Methods and apparatus for controlling illumination uniformity by altering the size of a slit are disclosed. According to one aspect of the present invention, an apparatus includes a light source, an exposure surface, and an illumination unit. The light source generates a beam that is projected onto the exposure surface. The illumination arrangement includes a first support surface and a first removable plate that is configured to be coupled to the first support surface. A first edge of the first removable plate and a second edge cooperate to at least partially define a slit through which the beam is projected.

Abstract: A device and method for adapting an arrow bolt fletching tool for use in fletching crossbow arrow bolts. The invention is designed to facilitate fletching crossbow arrow bolts, which are shot without nocks, utilizing a commercially available fletching tool which is designed and produced for use in fletching arrows having nocks which remain with the arrow and are shot with it. The invention provides for an end cap, containing a specially shaped indentation, to be placed in the end of the crossbow arrow bolt. A special fletching nock, with an end configured to fit within the indentation of the end cap, is inserted within the end cap for purposes of fletching the arrow only and is then removed. The fletching nock has a forked, or u-shaped, end, which engages the fletching tool in the same manner as a standard arrow nock.