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A laser collimator is a great tool for setting up the collimation but I would doubt if most of commecial ones would be very accurate out of the box because of the difficulty of making a "fits all" adaptor.
Their accuracy depends on the path of the beam being truly orthogonal. To achieve this you must first get rid of any slop in the fit then rotate the collimator through 360 degrees and ensure the spot does not move.
This procedure needs patient "Preliminary" collimating till the spot is in fact being returned near enough to its source to actually check it.
Part of the initial collimation set up is to check the centering, reflection (shadow) of the diagonal mirror on the main mirror. For this to be useful you must have the secondary holder properly centered also.
Pay attention to these basics first and then just about any laser collimator will give good results.
Barry
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