Boy howdy did I learn something today! I always figured that little sprung plate on the back of the tumbler was just to keep tension on things. I can state that my lock set does not have a lockout action to it, even though it has that assembly on it. I wonder if they break two different ways, either always causing the lockout, or never causing it...
I'm also almost positive that my new electrical portion has a lockout inside of it. I wonder if the newer (964) mechanical assemblies have no lockout, leaving it to the electrical portion. I do not know what my old (stock) electrical part was like, because it came out of the dash in pieces