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I drift align using my g star or Samsung cameras connected to my main scope.I use Al's graticule (free software graticule) to line up a stars proper motion with the drive turned off.Restart the drive and observe the stars drift up or down and try to correct it by either az or alt adjustment depending on the position of the star . By overcompensating you soon know which way to go. I believe that prior determination of which direction it should go just complicates the procedure , then once you know which way to go it is fairly quick ,particularly when observing the image on a computer screen. So why not put your guide camera on the main scope as it gives higher magnification and give it a go.
Philip
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