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Hi, Cam.
Have you tried with an aperture plate on the front of the scope? I have an 8" F/6 too, and have overcome the same problem as you. Just use a piece of card board cut to the outer diam of the tube. Then cut a 60mm hole to one side making sure it's between the tube wall and secondary mirror. Tape it in place, and give it a go.
Hope this helps.
Justin.
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