The tumbler is the part that the key goes into. It is made to turn only when the correct key is used.
Just for the heck of it, try running a hair dryer on it to see if something has frozen. They even make a product just for frozen tumblers.
Try that and let me know if it helps. If not, then we need to think about replacing the tumbler.
Joe
Sunday, November 28th, 2010 AT 7:13 AM