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If I may but in - hello Brendan - I am part way towards the infocus solution.
So far I decided to move the finderscope (SV F50M) to midway along the OTA and offset to the left 45 deg. I use my NEQ6 at minimum height and find mounting the finder in the OEM position a PITA. The mid OTA point remains roughly the same height and if your finder is a RACI its a breeze to use.
Now to the next step, the above mod removes the need for the collar, so either shortening the focuser mounting tube or shortening the OTA is a viable option.
Either option runs the risk of constricting the light path at full infocus. But do you need to remove the full 24mm from the Adv Focuser light path? Perhaps Alfred could be enticed to provide some visual observing dimensions on his CF version? Perhaps 20mm may be enough for most visual observing and would still remove the cutback in the existing OTA threaded area.
From Brendan's accurate measurements (24mm) between both types of focusers, I tend to favor shortening the OTA.
Another option if machining becomes too expensive in OZ is to get Moonlite to machine a custom made adaptor flange to eliminate the lack of infocus and also include an improved focuser mounting collar.
David
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