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first of all, have you culminated your laser? if not you could be out by dingos legs.
secondly with your mirror with no spot, take the mirror out and geometrically get a center mark with something like a compass, make sure you get a exact sizing of your mirror, then you can use the compass to find the middle quite easy. now this is the scary part that alot of people pack it actually putting something on the mirror. you have 2 choices. the little ring reinforces that you can by or alternatively a permanent marker. (don't fret the secondaray mirror blocks this area from light gathering anyways. once you have culminated the laser, then you should be done and dusted.
Hazzar
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