Why not grind away the section that is binding? From your 2nd pix, it only needs about 2-5mm for enough clearance. I wouldn't go any more than that for fear of weakening the construction. Mark with a sharp object to ensure the correct area is being reduced. Since you already have the stand it won't cost you anything but time, labour and duco / spray paint to protect the metal. If you don't have a grinder, perhaps someone near you can help?