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Wayne,
Good stuff!
I would measure the focal length of the reducer before going further.
The "standard" focal length of the x0.63 reducer (Meade and Celestron) is 240mm.
This should give the x0.63 at a spacing of 105mm. See attached spreadsheet.
(There was a batch of Meade reducers a few years ago which were produced at a shorter focal length...)
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