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Nice review Geoff.
One thing that struck me as I read it was, are you ever intending to image with it? If not, then lengthen the tube, or get the primary further away from the secondary/focuser, and get a nice small light smooth helical, something lower profile. If it ever does get used for imaging, then maybe you are stuck with having an extension for visual, and nothing for imaging. I would still set it up so that the focuser is almost at min when you image, and you may find that no extension, or very minimal extension is required. This is how my 10" is set up.
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