I have a Skywatcher 10 inch Dob OTA set up on my eq6 pro with and ED80, I get along fine with balance, even with the bits that the tension handle screw into. I'm not sure about the tube rings, the ones I have fit so there is no problem there, But I'm not sure Which ones I have, I bought them a long time ago, but it does go to show you that there are tube rings that fit the Dob OTA.
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