It's in his book The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes by David Kriege and Richard Berry, available from Willmann-Bell.  He has a page that you can xerox that has a master template good for several sizes of diagonals.  There is also a table that gives the proper offset.  Make sure you offset in the right direction, it isn't obvious.
Clear Skies
Don Colton
-----Original Message-----
From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com]On Behalf Of Jim Gibson
Sent: Tuesday, August 12, 2003 1:52 PM
To: Visit http://www.utahastronomy.com for the photo gallery.
Subject: RE: [Utah-astronomy] Lasers and collimation questions

Don
 
You mentioned: Dave Kriege's template
 
How do I get such a template?
 
Jim


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