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Refractor collimation is easily checked with a star test. Just target a star and wind the focuser in and then out of focus. You should see a wonderfully round ring pattern off focus.
If the rings are offset in any direction you have a collimation issue. Most refractors can be collimated on a bench with a Cheshire tube. Just check online for links to the process. Don't pay someone to do something you can do yourself.
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