Thanks guys for the comments. I think I'll get a manual focuser to begin with - the Williams Optics one is very good, cost through Frontier Optics about $260.
I have noticed in the glossy Meade catalogue that came with my LX200 that Meade does have these focusers, but for refracting scopes. Maybe they could be compatible...hard to tell from the brochures.
I wonder if the design of the RCX400 has addressed the issue of image shift? If it hasn't, then someone at Meade needs to sit down and sort it out.
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