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Nick, I only do up the "lock" screws on the primary for transport. Experiment with leaving them loose during your session, after you have collimated. Many people report that nipping them up tight pushes the scope back out of collimation. The only problem leaving them loose seems to be if the springs supporting the mirror are too weak - then the mirror can shift a little as you move the altitude from horizon to zenith. It seems that replacing the springs with stronger springs is a fairly easy task.
My 8" GSO has the original springs and I don't have a problem leaving the lock screws loose.
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