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Hi Pete
Might be worth enlarging on what issues you found with the ZWO OAG and what setup you were working with.
I have used both ZWO and the Orion TOAG. Both can do the job but I felt that the Orion was pretty crappy with the provided grub screws being made largely out of butter (resolved by changing them out) and the ZWO had flexure issues so wasn’t consistent.
Currently using an Astrodon MMOAG..no issues there but it’s quite thick compared to the other 2 so not sure how that would go with your Newt but if you are looking for quality then compared with the other 2 mentioned, a different league. (And $$$$...)
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