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Hi Rex,
Just a question..how were your images before you repositioned the centre spot on your primary?..the reason I ask is that sometimes a combination of factors can cause the misalignment you've described.
Some of these are...
Is the EP secured in the focuser?
Is the focuser aligned and working in proper motion without any slack?..(this can cause the EP to work one way..then drop out of alignment the other in which case you have to check and adjust by turning the tiny hex head grub screws on the top portion of the focuser next to the lock screw)
Is the EP being used in good order with no loose components? (lenses..base..etc.)
Check to see how much drift (if any) by turning the focuser in and out while viewing the centre spot via the collimation tool.
I hope it works out for you.
Cheers!
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