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Well I fixed it. Spent all night pulling it down and reassembling repeatedly.
The juttering was actually the worm gear jumping over the cogs.
I had to pull down the base and azimuth motor to get to the clutch plates. The plates were sandwiching the gear plate too much not allowing it the movement it needing to be moved by hand.
It shouldn't of been like that from factory but oh well, it's given me the chance to get to know the scope better.
I'm not entirely sure if it should be tighter or looser when moved manually but it seems to be firm enough to allow the goto to do it's job. I don't think these would ever be as smooth moving as a full manual dob (I haven't felt one before). But it seems fine to get away with without power but it would be better used with power given the manual movement is a little firm to be smooth.
I found some play afterward in the rotation of it from the spindle hole of the top clutch plate, which I tried all night to get rid of but it persists to stay there. It hasn't seemed to have affected the accuracy of the goto though so I guess I'll just live with it. May have been my fault, I loosened the spindle hole in the plate a little since it was biting on the spindle so tight, I did my best to centre punch the top clutch plate back firm which I was mostly successful but the degree movement stayed after reassembling.
Maybe it's just the nature of the manual movement of a goto dob. It wasn't there previously because it was insanely tight and unmoving.
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