Some of the ignition switches were able to be used without a key, with a small handle that hung down below the keyhole. Turning the switch to the right allowed the truck to be turned off and the key removed, and then all it took was a movement to the center position with the handle to restart. If the key was turned to the left and removed from the switch, the key was needed to turn the tumbler again. Turn left for engine off and lock, right for engine off and restart without needing a key. I rode a school bus for many years that was set up that way.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!