I prefer to think of collimation as simple if one simplifies his thinking: I "square" my mirrors up to suit the focuser...not the other way round. I added a mod to my primary mirror holder to take it "off-axis" if I chose to do so, or the necessity arose. Call it collimation in reverse if you want. lol. Imagine if the focuser was NON-MOVABLE....what do you do to "square" it to the mirrors? You "square" the mirrors to the focuser, yes?
I prefer the "caveman" days.
