Abstract: A support provides a relatively stable support surface for a first disk having an angled surface and a center hole. A second disk having an angled surface and a center portion is inserted into the center hole of the first disk, and a tensioning band encircles a portion of the first disk and the second disk to fix their relative position to one another by friction between the disks. An optical element such as a mirror or lens is mounted to the second disk. By angularly rotating the first and second disks relative to one another, the relative angular alignment of the optical element can be adjusted and fixed by use of the tensioning band.