by George Themelis, A.K.A. Dr. T., has examined many hundred viewers and has seen about everything that can possibly go wrong and has learned better ways to fix and improve them. Now he shares his experiences with the reader. A wealth of information for the Red Button (model 2061) Viewer owner. HOW TO: enlarge apertures for 8P, improve illumination, clean, adjust, select light bulbs and power supplies, tell single-element from achromatic lenses, inspect and buy, use, and much more. 8-1 2 x 11 SUPPLIED WITH: new 8P reflector and fine sand paper to clean the red button switch contact.