There is a thumbnail in post #7 from under the Dashboard that shows how the Steering Colum is mounted. The yellow arrow points to the pin that needs to be depressed and or drilled/ground out to get the steering Colum Lock out of the tublike mount.
Unfortunately the pic is kind of dark.
http://www.peachparts.com/shopforum/diesel-discussion/407340-1984-7-pin-ignition-switch-column-lock.html