New barrels for these euro locks are available from the likes of B&Q, but they are made in different lengths. To remove the barrel, there is one screw that screws into the middle, accessible when the door is open. Test the barrel once you have unscrewed it though as it could be the door lock mechanism itself thats causing this one. In fact, open the door then try to lock with the handles as normal...see if the lock works then.
John, May 2009