Originally Posted by BillGrissom

If yours broke like mine, I am guessing the problem is behind the part that Diesel911 shows. There is a spring-loaded detent behind there. The spring housing is weak pot metal and easy to break (just a question of time). Once it breaks, the parts jam the switch from turning.

To get to it, I had to remove the key arm from the column (look for release pin on front), then pick open the swages on the aluminum housing that hold a steel cover plate to remove that plate. I just left the broken parts out, so don't have the detents anymore (sounds like you don't feel them either), but the key has never self-rotated that I know of (my son drives that car, poor communicator). I recall that I used epoxy and swaged the aluminum (hammer & chisel) to re-secure the plate. I was tempted to leave the steering lock rod out since I doubt that helps much with security and adds some driving risk, but decided to leave it.

I have posted this several times, but it doesn't seem to "take" and people keep fooling with their lock tumblers to no avail.