To the left are illustrations of the consequences of not having regular maintenance performed on steel roller shutters. In this instance, the bearing has collapsed and the axle end has been running against the bracket. This has worn through the axle virtually cutting the end off.
Fortunately, the shutter was in the closed position at the time and did not fall to the ground. If this had failed while in the open position the outcome could have been much worse, i.e. the shutter could have fallen to the ground. If by chance, there was a person standing below this shutter it could have been a cause of significant injury (or death).