Did one a long time ago. Helps to mark placement of ignition switch
relative to column, switch is at base of column, connected to cylinder
by long rod through column. Once electrical switch is removed, rod has
to resistance. The casting flash may / may not be present, can be seen
with directional switch out of way. Later GM's use a pin bolt to hold
Basic Column wisdom.
Disconnect battery Unplug harmonica plugs at base of column
Chock wheels, set parking brake, shift column into neutral, if lock
cyl won't turn , Loosen bolt at selector lever / rod to bellcrank,
and manually shift trans to neutral, than column to neutral.