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Hi Guys
The quickest way is to use a laser collimator
Use on lowest power setting
Adjust the three outer screws of the secondary mirror until red dot of collimator is centre of dot primary mirror
Have scope horizontal, and target of collimator facing down the tube, slightly loosen the three locking screws holding primary mirror
Adjust primary mirror, until no image on the target
Secure locking screws primary mirror, ensuring primary mirror stays aligned with target of the collimator
Takes only a few minutes to do
I use my 10" collapsible dob away from home a lot with school and scouts programs, and hardly never needs adjusting
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