Is an ignition lock reuseable?

I have the '69 factory service manual. I dont see any instructions in there saying how to take lock cylinder out of switch? From googling seems you have to turn key and push some button in somewhere? A and B bodies same ignition switch and 69 is unique. All I see in FSM is remove collar unplug switch and reverse not a single word I can find about removing lock cylinder from switch?? Anyone got a page number??