Just order a tumbler from the dealer. It isn't very expensive and it will come keyed to the car and you get a new key with it as well. Whatever route you go do it quickly because if you can turn the key it is a 10 minute operation. If the key will not turn..the lock housing needs to be cut out and it isn't pretty nor cheap.Thanks for your reply. Do you know if the original keys will still work when you replace the tumbler? I have removed the tumbler and tried to file (from you tube!) without much improvement.