you need a new barrel
to remove, open the door, on the lock-strip just below the centre of the barrel is a phillips head screw (some older ones have slotted screw). remove this.
insert the key and turn to the 2 or 10 o`clock position and pull barrel out.
you can buy these cheaply on-line and note that they come in many various sizes. most sites tellyou how to measure.
levilewy
March 2010