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Thanks for the response.
I am certain the Focus Cube 2 is attached correctly. It is pretty hard to not attach it to the flat part of the spindle. I will recheck it again just to be sure.
The thing that really bothers me is that if I grab the telescope tube itself and then grab the camera, I can move the camera in and out by that couple of mm. It is very visible. This suggests that the focuser backlash is the actual problem.
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