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A laser can be a handy tool, but can be considerably better with a few adaptors. I use,
1) a basic laser beam to square the focuser in the secondary cage
2) a holographic grid attachment on the laser to centre the secondary in the focuser and to rotate the mirror to face to the focuser
3) the basic laser beam to aim the secondary at the primary
4) A barlow attachment on the laser to aim the primary at the secondary.
When star testing after aligning with these tools, the primary does not have to be tweaked at all.
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