Rec'd and just what was needed to modify my wife's Zimmer to full mobility zo that she can move around our large garden with moderate ease. Unfortunately had to refill stems to allow frame to move ina straight line because she is unable to enjoy our garden as the four wheeled rollator wheels tend to cut into a wet lawn or travel over a pebbled drive. Wished the stems were drilled at 45 and 90 degrees to the wheel axles!