http://dieselgiant.com/repairignitionlock.htm
This DIY has good pics ot the assembly. Of course you won't have to do any cutting.
You will not need to remove the tumbler... just keep the key in position 1 to: 1) keep the steering lock from engaging 2) keep the security pin retracted and 3) keep the lock on the ignition wiring harness disengaged. There are three screws on the back side of the ignition switch (conceled by the wiring harness plug) that secure it to the steering lock assembly.