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Did you notice that the elongation is in the RA axis direction?
I have a persistent problem with my HEQ5 RA that I can only resolve with careful balance and polar alignment - the result is eggy stars with subs over 5 minutes. It shows up in PHD2 as a 20 to 30 % higher RMS deviation in the RA axis tracking. I tried belt modding and rebuilding/tuning the RA axis to very little improvement. The only thing I can think of to try, short of upgrading the mount to an NEQ6 or similar is to rebuild the RA axis again with a lighter weight grease to try and remove all resistance.
Then again, I do have 11kg on the mount and that is pushing the weight limit. What weight do you have on the HEQ5 if I might ask?
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