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I'm with Fred and Geoff here. Guide rings with delrin or PTFE-tipped adjuster scews are the devils work, and like any axially-adjustable device, introduce all sorts of potential flexure problems - not to mention tube scratches and indentations, accidental rotations, weight, etc, etc.
I opt for double clamshells or rings to hold the entire absolutely assembly rigid - and rely on the modern guide camera (QHY5 in my case) to be able to discern the faintest star to guide on. It's a rare thing that I can't find one anywhere I point it - and I run a 60mm guidescope!
Your system looks interesting though Barry - because you don't have adjuster screws but solidly-clamped rings. You have the ability to axially offset your guidescope still by adjustments in the base. I guess that as long as your threads and buffers soak up all possible flexure due to sloppiness then it looks great. How heavy is it?
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