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I know I'm going to be swimming against the tide here, but here goes.
I use a 5" refractor, 10" SCT and a 10" GSO RC on a Losmandy mount. All scopes have another Losmandy rail on the top to which I securely add my guidescope fitted with an x/y shifter and DSI II Pro guide camera.
I have a set of rings around the guidescope that CLAMP the OTA of the guidescope securely and tightly. THERE IS NO FLEX IN THIS SYSTEM. If I use rings with three screws to hold the guide OTA there WILL be flexture.
My SCT does not suffer from mirror flop and I have successfully guided it at 2950mm focal length for 40 min subs with round stars. That is not to say that these subs are not full of plane and satellite trails.
I've tried three sets of OAG and I do have a lodestar and found for me they just give unparalleled frustration. Ive never failed to get a GUidestar with the DSI and my 72mm guidescope, NEVER. The x/y shifter helps here and is invaluable and I guess that's why they are not made any more.
I should add that all scopes are fitted with moonlight focusers with stepper motors for autofocus using Sequence Generator Pro.
So there you go
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