Lee this was a optional, though very short lived, anti-theft device. It was to be activated by using special quick change bolts to swap the starter and distributor. So a would be, thief would, upon trying to figure out why the car wouldn't start and opening the hood would see all the parts there-but being a dumb thief- would not recognize the switch. As stated this option was withdrawn from service after the only car so equipped, was sold to an novice buyer in East Undershirt New Jersey in May of 1947. Buit you probly already knew all that.