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I use a chesire-crosshair to align the secondary with the focuser..then the secondary with the primary to as close as I can in seeing the reflection of the primary in the secondary..
On location and after the scope has cooled down...I then use a laser to fine tune until the laser can be seen returning to it's source precisely!....
Also...it is a good idea to check that your focuser is in alignment..ie if you remove the secondary mirror and insert the laser..the spot marked by the laser on the inside of the tube should be directly to the opposite side of the focuser...most focusers can be adjusted for this purpose.
A word on laser collimators...check to see that it too is collimated before using it!!
Cheers!
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