I recently acquired an AT111EDT. It is the older style with the R&P focuser. There is a "rotator" on the focuser that looks very good, but I find that when the knob is loosened the rotator assembly is too loose and allows a good deal of wobble. I'm concerned about this because if you loosen to change rotation and then tighten again with the weight of the camera pulling it down, it might end of not straight, putting the image sensor at a tilt. I've talked to Astro-Tech about it and, so far, they claim that this is "normal" behavior for this scope. But I've studied the mechanism and am convinced that it was originally intended to have another part that mine is missing. This part, a ring of low-friction material such as delrin, would fill the gap between the back of the draw tube and the rear surface of the rotator assembly.
In the drawing here you can see the 0.5mm gap between the draw tube in blue (with flange) and the housing in red.
Do any of you have this scope? If so, when you loosen the rotator knob, does it become wobbly, or just allow rotation?