Thanks Colin! :-) Yeah, good idea, I'll test it after rotating the primary without recollimating and then collimate and test again, assuming I get that far.
I'm pretty suspicious of focuser axis alignment by way of the secondary... I don't trust my skills with the auto collimator and I don't know if I have the spacing on it right which could be throwing me off, so hopefully I won't get to the point that I have to rotate the primary anyway.
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