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If the beam appears to trace out a circle when rotated and projected onto a wall say 3 metres away; the trick is to know which screw to adjust.
A bit of paper blu tac'd to the wall mark the circle; guess where the centre should be and mark it with a dot, rotate the collimator until one of the adjusting screws is at the top, and adjust it to bring the image about half way to the centre; rotate the collimator to bring the next screw to the top and repeat, same again for the third screw. This should allow you to get the image pretty central and fixed within a couple of iterations.
( If your collimator is like mine and has two sets of three screws, alternate the adjustments between the back and front set of screws to bring the body of the laser onto the axis.)
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