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I just bought one of the EQ6's myself and observed a "NO GO" zone myself. It turned out to be I had not balanced the OTA on the mount properly and when it got to a certain point it just slipped on the internal clutch mechanism. Balancing it properly fixed the problem. As for your grinding, who knows? I do know that there are a few grub screws that can be accessed from the outside and a few adjustments that can be made by removing the circular black caps. I know this because a member of the local astro club told me. He also warned me NOT TO TOUCH THEM if I didn't have a clue, which I don't. I don't have any grinding or such but I will be seeing him in a week or so and he is going to have a look at the meshing of the worms and optimize them for me. Perhaps that is all your problem is and an expert can fix it. Lets hope!
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