For the Argo Navis, don't worrry. The clever little beastie works it out for itself. Plonk the base down - doesn't matter if it is not really level, plonk the OTA on the base and push it to the vertical stop - doesn't matter it it is not really vertical. Fix Alt Ref with auto adjust on, Align star and away you go. Obviously Align each time you set up the dob, even in the same location.
I though the same when I started.
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