I get into a mess with it sometimes I am probably tired but try this.
Point the scope at the ruff poss pointing at the pole (in home position) take a time exposure. Look at the image and you will see the strars starting to make circles adjust the mount and try to centre them and repaet the process until they are centred in the image, add a barlow and do it again. I have had good results and not so good but mostly good.
alex
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