Post mortem - I took a close look at the trim rings looking for a definitive reason for my ball-nut contamination and eventual failure. The trim rings are made from a fairly soft material, maybe TFE or HDPE, and once in place, they are ‘retained’ by allen set screws. Set screws into soft material is in my book asking for trouble. Take a look at the photo of my suspect trim-ring. You can see the damage caused by the set screw. I have to believe in this day and age of 3D printer s and other sorcery, a better solution could be fabricated that not only keeps the innards retained in the ball nut, keeps contaminants out (saw-dust), but is made from a more rigid material that can withstand a pointed set screw being driven into its side. Thoughts? - Charlie
