Well done. I wouldn't trust myself to make the rods or holes, but there's a good little engineering shop in nearby Warwick who have done obs work for me in the past, so sounds like a good project for early next year after I've taken a few "before" happy snaps.
By the way, your pics show the process needed for rotating the secondary cell pretty well. Did you bother doing that?
And a lucky last; any idea what the GSO corrector to sensor distance is?
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