is it this white thing in the orange box?
OHH, I see what you mean. You want to just pull the cylinder without pulling the whole assembly. I've actually rebuilt/rekeyed these before. It's pretty easy.
The part with the box in that picture is actually the nub that pushes the button to connect the signal for the door open beeper.
You're gonna have a hard time getting the lock cylinder out without removing the whole assembly from the car. You have to drill a small hole on the sides of the brass pins, and pop them out with the edge of a drill bit, or whatever. Then the cylinder slides out. Just JB weld the pins back in again. I've done this a few times, but never with the rest of the ignition attached to the steering column. With it in that orientation, it would be hard to get the ball bearing/spring back in for the steering wheel lock.