I am guessing it was 30 years of locking/unlocking the drivers door manually with a key that caused the keyhole to slightly crater inward and causing the lock mechanism to be a little loose. Even though I am no longer using the key to lock/unlock the cruiser since I installed a remote keyless set up, it still bugged me that the lock was loose. I took it back to my PDR guy who massaged the keyhole from both sides and made it look good as new. Lock mechanism fits on tight now.