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And I just remembered. Adding the MPCC to the LX200 required a 2" eyepiece holder as it does not just screw on to the rear cell. So I got a JMI EV-1 crayford focuser with the larger mounting base which screwed onto the larger opening of the rear cell (3.25" diameter thread in my case). All up a rather pricey fix but it fixed the focusing problems I was having anyway. You need to focus to less than 1/3 the thickness of a hair at 1600mm focal length and the primary mirror knob is not up to that and wobbles the whole scope when you try.
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