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First thing you'll need to do without the aid of any laser is center your secondary visually under the focuser. I'd start by squaring the secondary with the spider vanes, also center its axis in the tube, then center it under the focuser so you see a centered circular shape (outline of the secondary mirror against the focuser and tube background - ignore any other reflections). Then tweak its tilt until you get the laser spot in the center of your primary. That's ll get you started.
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