I built my own laser collminator, and used a $8 HK cheepie. it too sends out this beam, but remember that the center dot on most reflectors is the size of a pen, im guessing for visual at least as long as you can get that laser on the primary marking and back into the front of the laser itself it doesn't matter if its a little oblong
One of the other things that i do is shove my collminator into a barlow, it gives a reasonably round dot thats about 4mm larger over all than the original dot. makes putting it in the circle alot easier.
This is the method i use also for doing goto aligning when i don't have my 12 mm rectical handy, i unfocus untill its a large doghnut thats about the size of the FOV of the eye piece and then make sure its even right the way around.
hope that helps
