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Yes i think that process is probably the best way. My backyard doesn't really allow pointing a telescope anywhere but up though and I've only had the OAG for a couple of weeks - so no moon or that many clear nights for testing so far.
I found what I think is the issue while adjusting the spacers tonight. I've only had it setup up three or four times so I never noticed before but the prism has a pretty major defect. Hopefully I can just return that part of OAG instead of the whole thing, but eitherway it certianly explains why I thought I was spot on with adjustment then after slewing to another target it was completely out of focus again without actually touching the focuser.
You can see the spot in the prism where the defect is in the photo attached.
I've had a set of calipers out measuring it repeatedly and just couldn't figure out what was up, but then I have only looked at it outside it the dark until now - never saw that imperfection in the prism until now.
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