Check out my fast change self collimating diagonals. Go to my homepage, then telescope making pabe. -- Clear skies, Mel Bartels Programmer/Analyst, amateur astronomer Eugene, Oregon, USA homepage: http://www.efn.org/~mbartels mailto:mbartels@efn.org atm, atm-digest list-owner Motorize A Dob: http://zebu.uoregon.edu/~mbartels/altaz/altaz.html