Roller size and type: There are different sizes and designs of roles. There are also times when rollers are not available on the market and our technicians need to do door modification work. We may refuse the work of customers who hand over rollers that are completely different from the genuine ones, so we strongly recommend using exactly the same type of rollers for a smooth winding system. Door removal and installation: For most jobs there is room to remove the door to replace the lower rollers. However, on rare occasions, you may not have such a permit that requires you to disassemble the frame and glass before starting work. After that, reassembly is required. Rail system: Roles are the problem most of the time. There are still some cases where trucks cause problems. Since the rollers roll on rails that protrude from the ground, wear on the rails impairs the smooth running of the rolling system. To schedule an appointment to troubleshoot your sliding door system, please call +65-98112405.