The various technologies presented herein relate to positioning one or more devices of an optical apparatus. In a general embodiment, a tube having a threaded external surface is secured to an alignment ball, the alignment ball being located on a pair of bearings. Attached to the tube is a flange comprising a threaded aperture having the same diameter and pitch as the threaded external surface of the tube. As the tube is turned rotationally about its length, the position of the flange is change on the external surface of the tube.
STATEMENT OF GOVERNMENTAL INTEREST
 This invention was developed under contract DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy. The U.S. Government has certain rights in this invention.