If it's like my 84, there is a small metal piece fitted to the back of the
lock that rotates with the cylinder . It has the 'fingers' on it that work
the latch.  There is a small pin (1/8") that holds it to the cylinder.
Tap that pin out and the small metal piece will come off, then with the
key turned half-way in the lock, the cylinder will come out through the
front of the lock.  I used a piece of metal coat hanger cut to 3/4" long
and a hammer to tap out the pin since I didn't have the proper tool.

Be careful with cylinder once it's out. The springs and discs will fly all
over the place if you're not careful.

Hope this helps.
Brian

On Tue, 11 Apr 2006 17:48:42 -0700, Shawn Wright <swright@ZUIKO.SLS.BC.CA>
wrote:

>Sorry for reviving this old thread, but I'm still searching for an
answer... even if I buy a new
>lock, I'll still want to open it so I can re-key to the other doors. I've
had the slider and front
>door cylinders out, but can't seem to find a way to get the rear
cylinders out of the lock itself.
>There is a circlip which holds to the lock in the plastic housing, which
I've removed, but I can't
>see a release button for the tumblers.
>Any ideas?