I have a curved shower door which runs on 4 runners each with 2 wheels. The bottom outside runner keeps jumping out of the track when the door is closed. There appear to be 4 gaps on the rails that would have allowed the door to be fitted onto the rails. The top 2 gaps have a sort of cover on them but the bottom two don't. The top runners have some sort of adjuster screw but it doesn't seem to make any difference. I'm at a loss to work out why the door is not staying on the rail and how to fix it. I can video it if that might help. Any one got any ideas?
John