I wouldn't belive that it would have to be dead centered. but then again, in my laser collminator the laser is within the housing with 2 sets of 3 bolts holding it center.
very easy to collminate, put it on the V jig, twist it round and mark 3 120 degree marks, then make a line into the center, to give you the center of your circle, then its a matter of twisting the red dot to each of the 3 marks you made and then adjust so that the red dot travels towards the center mark. it took me less than 5 min to make sure mine was happy days, and i did it over a 5 meter range. it was good enough to get everything roughly lined up then i shoved the ceshire in. happy days. but the foil would give a tight round dot to work with not a slighty glowy oblong
