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Sorry Neville, I don't have the scope any more to be able to measure the thread sizes for the adapter. It is whatever size the external thread at the rear of the Mak, where the diagonal fits and likewise, the internal thread of the SCT focuser where it would screw onto the rear of an SCT.
Tried doing a quick search for schematics of the GSO focuser but couldn't find any drawings, must be out there somewhere, surely.
Actually just found that the Mak thread is probably M44.5 X 1.0 P , the SCT focuser thread size may be 2.00" X 24 TPI . Whicg would mean that the adapter you would need would be M44.5 X 1.0 P internal thread and 2.00" X 24 TPI external thread.
Maybe someone else out there could confirm the sizes.
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