I ordered a new original-keyed tumbler...took about 2 weeks. I found out that I have an old style tumbler that doesn't have the release pinhole from the front, like just about everyone else on this message board. Mine has the release pinhole on the ignition lock body. It is located at right angles to the key axis, about 1.5 cm underneath the dash at about the 1 o'clock position. The detent on the tumbler can be depressed when the key is on position 1, which allows you to withdraw the tumbler and key.

My previous post mentions a snap ring. All it does is hold the tumber assembly together. Nothing to do with withdrawing it from the lock.