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Hi Mick,
I have a JMI Moto Focus on my 16" Newt. Have had no problems with it and it really comes into its own with my Saturn imaging. The only time I use it as a moto focus is when I am imaging.
I rolled some quarter inch thick aluminium plate to the same curvature as my tube, did this for the OD and ID. The JMI Moto focus bolts through both aluminium plates sandwiching the tube. The plates are approx 6 inches square, they spread the load on the focuser over a larger area and I think this alleviates flexure along the axis of the focuser.
Regards
Trevor
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