Howdy all; I got all the images and plans for the SAC tracker and send them off to Stan Clark the SAC webmaster. He did a masterful job of posting it all on the web site and a link is on the front page. If you are interested in building a barn door style tracker, then take a look. It is the curved bolt style, with stepper motor drive. Please provide some feedback. I have had some very nice results with mine, it is the easiest astrophotography that I know how to do. Clear Skies to us all; Steve Coe -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.