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hi chris,
don't worry mate it can easily be brought back to collimation!!!!!!!!!!
i removed my mirror on my 16"lightbridge and cleaned it the other week and when i went back to collimate it i couldn't see the laser beam hitting my secondary..
first you are using a laser to collimate.if yes collimate the secondary to the donut on the primary mirror when centred release your 3 lock screws on the primary cell if you can't see the return red dot grab a piece of paper A4 size and hold it up beside the secondary and move it around till you see it on the paper then move your appropriate adjusting screws on the primary to bring it back to centre your laser collimater.re check your secondary again back onto the primary mirror then your primary back into collimater,i always check twice then tighten your primary screws that you loosened and all should be back to normal.....
hope this has helped
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