Both Adam. Using two of them, the ever-so slight flexure I experienced with the single clamshell is now completely defeated, and in doing so provided me with a stable platform on which to mount the additional top plate. In reference to adjustability, the two Losmandy clamp blocks, ex. a set of Losmandy guide rings (which I loathe - and are in most cases a waste of time in my opinion) let me slide the entire guide scope up and down part of the length of the Sky90 under it. Great for balance fine tuning.
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