Thanks Dunk,
I've done some testing and found that no matter where the reducer is inserted, at the visual back or on the focal tube, focus can only be reached by moving the mirror as far forward as possible and mounting the camera or EP as close as possible to the reducer.
There is a disconnect between what Celestron says about the behavior of the reducer in the telescope and what actually happens. When the reducer is mounted in the focal tube of the Moonlight and a camera installed with the shortest adapter I have, which inserts completely to the camera body, I can just reach focus with the mirror at its uppermost travel (maximum counterclockwise turns on SCT focus). The distance to the sensor would be very close to 110 mm as Merlin suggests, but the mirror location is at odds with what Celestron says "should" happen.
I've decided to do some more research and testing to understand exactly what is happening. Good learning experience, I'll have to actually study the mechanics of setting up an imaging rig, not just read the words.
