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I use the older style of laser colimator and in order to check the alignment. With the scope horizontal, I use a small pocket mirror held under the secondary mirror to view the beam going back to it's source. The image I look for is an illuminated red "donut" around the exit point. This would suggest that the beam has returned to it's source and the beam flare has illuminated the exit point in a perfect circle. Some beam patterns are shaped like a flying saucer..the trick for this would be to rotate the collimator in the focuser until you see the flying saucer shape image in the pocket mirror..then gently nudge the spider vane holding the secondary..the return beam should sit over it's source of origin exactly.
Cheers!!
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