AN960-1016 washers have arrived, so trial assembled the roll controls. No soup, the washers don't fit into the back side of the IGUS bearings. :( Made a strange arrangement of hardware washers to fix 2 x AN960-1016, (one at a time) on a 1/4" bolt, and chucked the result into the bench press, in accordance with a hint read LAST NIGHT in Sport Aviation. Second time such a hint has been incredibly timely for me. Using a file, then sandpaper down to 180G turn the washers down to a 28mm diameter, with a bevelled edge, which fits nicely inside the back face of the IGUS bearings.