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Not often. The 6 point system works on 3 pulling and 3 pushing. the 3 pulling screws are spring loaded. The idea behind it is to collimate with the 3 sprung ones and then lock them with the 3 pushing ones. Problem is if you do up the pushing ones just a smidge too much it changes the collimation.
The principle is to lightly finger tighten the lock screws but I found it kept going out of alignment too often so now I get it as close as possible with the sprung ones and then collimate it perectly by doing up the lock screws tight and collimate using them. I know it's the wrong method for this design but hey, it works and hardly ever goes out of collimation any more.
But it was all so much easier on my old 3 screw reflector!
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