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Speaking from experience with tuning HEQ5 Pro, so YMMV...
Does it move smoothly in RA if you move the RA worm carrier out of the way? That should reveal whether there's anything wrong with the ball and conus bearings on the axis. On the HEQ5 Pro mount there's also a washer next to the brass worm gear (clear on one axis and red on the other), if you forget that the axis moves jerky in places.
Next, I'd put the drive bits back, one at a time. Does it move smoothly with the worm gear engaged but the motor and transfer gear disengaged? With the transfer gear back? With the motor back?
Cheers
Steffen.
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