Non-turning locks as usually related to failing/worn leaves or springs that are basically done.

OR the tumbler is wearing out and the leaves now wobble around in there and don't work properly (my problem).

Just remember that the spring was messed up for a reason...I would not be too terribly suprised if you are back in there before too long with a very similar problem. Next time you are at the wrecking yard start lookin for a passenger side door lock tumbler to put your leaves into.

Thats what I did on the SD...I've had that door lock out about 7 times. *sigh*

Ya get good at it after awhile