The roller is spring loaded, similar to a toilet paper holder bar, and has to be pushed from one end. It will give while the other end will not move. The spring is quite strong and takes a lot of pressure to make it move so it will come out of the bracket. We raised the interior side of the slide with wedges as far as we could and then used long bars to reach inside and force the center pin (square) out of that end of the bracket. Once out, we repaired the roller by cutting off the rubber and pressure forcing a piece of heavy duty 1 and 1/4 inch PVC pipe over the roller. We then replaced the roller. We then checked the slide and repaired it with a flat sheet of aluminum plate to cover where the slide had been damaged the width of the slide. Have had no problems since.
Roy Warren