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hi Chris,
with your re-greasing and worm mesh, do you have any play in RA at all when parked. its more obvious with an OTA than without.
what type of grease have you used?
I've tuned EQ6's and what I noticed was that with anything other than superlube, although the mesh seemed tight, it was in fact spongy with oscillation in RA as you're seeing.
Other thing you could do to identify is capture video of either a planet or the moon and watch the movement. that'll give you a better idea of tracking issues than a guide monitoring.
Finally, the guiding is it with an OAG or a guide scope?
have you examined the RA ring gear closely?
you've eliminated issues with the worm by swapping but how about the gear?
Cheers
Alistair
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