[Goldmine]

My toilet bi-fold door came off the door frame as I tried to open the door. There was difficulty opening the bi-fold door. I used some force and the whole door came off. Fortunately, I was able to hold the door firmly and prevented it from hitting my head and toes. If not I would have serious injuries. The bi-fold door is quite heavy as it is made of metal frames 

The top roller broke a leg. I think I need to replace both top rollers. Where can I buy these rollers. Any shop in Singapore selling these rollers?