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On my ED80, there are 3 screws on the front and back of the dovetail (vixen style dovetail). The centre one fastens the OTA ring to the dovetail, and the one on each side are jacking screws. I used this arrangement to align my ED80 with my C11, so both scope point to the same place.
then I use an Orion XY guider to select a guide star if I can't guide off one in the FOV.
Al.
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