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A little trick that i do to help with centering the secondary is get a piece of card that blocks the view of the primary mirror thus eliminating a distraction and sits behind the secondary basically making a Equal Angle behind. then you can stand right back and line up your eye as best as you can with the focuser this will help you approximately center secondary.
Failing that a Cats eye sight tube does the same job but with alot more precision.
Brendan
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