Seems like a lot of hard core collimaters use the Star-Test to check their work. Accuracy of your dots, on secondary and primary, can affect colimation. The Star Test does not require dots. I think f5 and f6, for sure,collimation is rather straight forward and I would not bother with laser. F4 it gets a little trickier.
A refractor cures the collimation issues. Erik Kurt, Bryan Greer (Protostar) may have the secondary holder you are
looking for. http://www.fpi-protostar.com/
Daniel's V-block method for checking laser co-axialism with the barrel is simple and sound.
I must add that when I use a laser for collimation, I still base my final, critical adjustments (if needed) with a star-test- now there's a dirty word for you. I've been recommending Dick Suiter's book for years (Star-testing Astronomical Telescopes) and still do. Judging a diffraction pattern can be a difficult thing to do for many people, but if you can, you will possess a powerful tool, independant of commercial gadgetry. _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com