My two bob worth.
I have an older colimator that i dont use now and it collects dust now thanks to Howie Glatter. But anyway check the slop between the colimator and the focuser then you may find you have to put one layer of sticky tape around the colimator to get a snug fit.
Try and put the colimator in the spot every time you put it in and pull it out.
Those pesky mirror lock screws rip them out and throw them away there useless ( why would you colimate your scope only to throw it out when you tighten them things up).
And as said check the collimator itself.
Hope it all works out.
Cheers Kev.
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