Might pay to be a bit more specific about the 70ED Morton. If it's the Stellarvue, then maybe ask Vic himself, he should know.
In my case, as far as flatteners go I've had good success with an AstroTech AT2FF, and have used it on a variety of refractors, currently on a W/O GT-81, and a Lomo 102/650. For a reducer I have had success with the Televue TRF2008. AT2FF is happy about 56mm, the TRF2008 seems to like being about 50mm, weird I know.
Gary
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