I just had a look at my AE-1 with assumption that the lock is the same:
-) at this location the body has a 2-layer shell: the outer cover and the casing of the take-up chamber
-) the door lock is situated at the small side of the camera between those 2 shells, unaccessible from the inside
-) access to that lock via the outer shell is blocked by the flange of the back-door
But the lock is actuated from the top anyway:
-) the latch has got a right angle that protrudes under the top cover where the rewind axle arrests against it whilst pulling up
-) you might form a hook and insert it into the hole to mimic this action (as Shutterfinger just described)
-) if you fail you have to take off the top cover (the only difficult stage is taking off the rewind lever)
-) for remounting the knob/crank look for a tool that fits flat as good as possible into that "fork" end of the re-wind axle. Maybe you have to file your tool up to size. Then screw the knob on using your tool for counter force.
Last edited by AgX; 06-18-2014 at 03:31 AM. Click to view previous post history.