１.If the hanging rail is not match with the sliding door roller, then we can choose a whole set of sliding door accessories.
２.If the hanging rail is getting deformed during transportation and installation, then you can replace the rail.
３.If the hanging rail is not parallel to the floor, then you can adjust the position of the rail to make it parallel to the floor.
４.If the bottom of the door can touched the ground, then you can adjust the height of the door. There should be 10mm gap from the bottom of the door to the floor.
５.If the sliding door roller is getting rusty,then you can use a good quality roller to replace it.