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When you do the job "assuming daytime" first align on a small distant object and as you replace each screw re-centre the object in the EP. If you can see stars at the moment you don't have "bad" collimation. Bad collimation is when all you can see in the EP is a blurr, and adjusting the knobs simply adjusts the level of blurr. You don't want to go there believe me.
I also think this a job best done with the scope near horizontal. That way, if something goes wrong, you wont drop the secondary onto the primary.
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