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Important update.
Mounting the Pegasus Focus Cube 2 on my focuser is almost foolproof. The focuser's shaft has a small V shaped groove in it at the course end so it is virtually impossible to install the Focus Cube 2 the wrong way if you screw the grub screw into that groove. Somehow the little grub screw managed to loosen itself just enough so that it wasn't sitting in the groove. I pulled the Pegasus off and had a good look at it and I noticed the grub screw was loose. I am certain that I tightened it during the installation.
Anyway, it is very tight again and there is no huge backlash apparent anymore. I am uncertain if it was my fault with the installation or the grub screw just loosened itself over time with movement. This has been a somewhat recent phenomenon so I might have missed the V groove and the general usage just compounded the looseness. I feel a bit stupid now. I hope this helps someone in the future.
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