Here's a link to a page that has some instructions on SCT collimation
http://home.comcast.net/~astrophoto/...ollimation.htm , have attached a diagram from the page that aids the process immensely but take special note of this rule amongst the text "All that matters is that the screw that is lowest to the ground be called “A” in the drawing and that the eyepiece be pointing up away from “A”.
This info and the use of Bobs knobs makes SCT collimation a lot easier
