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I hope you have never touched the RC primary, as once changed, even slightly, there is a world of pain to get if back. There are many threads on various forums (most on Cloudy Nights) dealing with RC collimation problems. Most RC collimation issues can be traced straight back to the owner, who messed it up in the first place. Research well, before you touch anything. And never buy a used RC, chances are many are sold because of collimation destruction.
PS, if this is a GSO RC, they are prone to focuser misalignment (even with a Moonlight), and the collimation ring can only fix it in one position ( as you rack the focuser in and out, you can watch your laser dot migrate back and forth across the field).
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