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I don't know if this'll help...
When setting up the Dob and using the Eastro sky navigator....I first set the optical tube to horizontal at 0 degrees...rest my spirit level on the tube and adjust the height accordingly..rotate the base 90 degrees and do the same.
I found out from previous experience that there may be a varience between the base/mount and the optical components..from then on I check the level from the optics!
As for those bubble levels..some are the self-adhesive type using double-sided foam mounting tape about 1 to .5 mm thick.
I would remove the mounting tape and just stick it on with a dab of contact adhesive!
Cheers!
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