The present invention is directed to a magnetic indexing device that can be connected to a conveyor, the device firmly holding a golf ball in a particular orientation for the purposes of printing of indicia and logo on the ball when device and ball move along the conveyor. Auxiliary coating sources are modulated for depositing a desired sequence of material onto the substrate. A second optical element is placed on the other plate surface side and transmits at least part of light emerging from the other plate surface side.