Paul from SWISCO responded:
March 1, 2016
Your mirror door should have bottom rollers, based on what I see in these pictures. I don't know how they would operate without them! I would recommend removing one of the doors to look under to see what kind of roller is there. Specifically, I'd like to know if the wheel is concave or convex. All you might need to do is adjust it to ride more comfortably on the track. If that doesn't work, then I need to know whether the wheels are concave or convex.
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