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Gear that fits together with fine threads of say 54mm diameter are great but gear that stacks and is held together with thumbscrews is fraught with problems.
I have had gear that mates fine but the screws pop them out of alignment.
The solution then is some machining on a lathe...
Keep the OAG for long focal length fun, thats where they come into their own.
Good luck.
GlennB
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