I have an 84, not an 81......
 
I *did* have to remove the steering = wheel from the steering
column to replace the ignition switch = itself.  If memory serves,
it was necessary only to get at screws = etc holding part of the
plastic steering column cover so that = the COVER could be
removed.  I think the big nut = under the steering wheel's plastic
face is 27mm, but it's been = awhile....  It wasn't really a big deal
once I got a good socket on that = nut.   If you try it, pay
attention to the orientation of the steering wheel when you
remove it so you can put it back the same way.
 
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Steve