Thank you so much Xstreams for your detailed advice.

I'm beginning to wonder if there's a problem with my AVX. I have a CGEM also that I don't use much - it's a heavier mount and I don't think I need it for my AT115EDT. But, I'll pull it out of the garage when the skies clear and see if it has the same problem with the autoguide module as the AVX has.

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