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I use a Planewave CDK, and for the final tweek, I use a test exposure of a star field, anywhere from 30 sec and up (so long as tracking is good enough). I look in the corners of the exposed image on a full frame chip and make sure the star shapes are round. I do this at camera angles 0, 90, 180 and 270 deg. The star shapes tell me which way the collimation must go and so I know what turning one of the collimation bolts will do to the star field...that's just trial and error to begin with.
HTH...
Josh
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