I can't help you Granada, other than to offer sympathy and condolences. My 8" go-to has a similar sort of very slight jerking/sticking in the azimuth bearing motion. I've taken the whole thing apart (twice), made sure there was nothing over/undertightened or dirty, but for the life of me I can't work out the reason for it. I hope you get it sorted, and share your wisdom here! Good luck.
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