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What focuser is it? Moonlights are generally aligned from the factory, but do provide three set screws for tuning on the scope. When I built my refractor I just made a target to fit over the front of the scope objective with a small hole in the exact centre . Stick a laser collimation tool in the focuser and see where the spot falls. Tune with the set screws to adjust the laser to dead centre. Then using a normal cheshire technique tune the objective if needed but since you have not touched the objective it should be good. Do a star test as final check. Done.
PS, you need to be confident that your laser is properly aligned first.
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