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Hi Merlin
I follow your method OK and it should give reasonanble results particularly on some scopes I have fixed where you can actually see the difference in height. However measuring the orthogonality that way will not give the precision that I strive for.
Yes if you can get the dec pivots to about half a mm and the OTA square to this your gotos will be well inside a 26mm eyepiece anywhere. On my permanently polar mounted scope that had been set by my method I had gotos within +/- 2 arcminutes anywhere any time.
Barry
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