Success!!!
I was in the right church, but sitting in the wrong pew.
I messed with that thing for about an hour today before I figured it out. The door panel was not putting pressure on the rod sleeve when I looked down inside. It just killed me that the door would open sooo easily without the door panel on.
Then I noticed how difficult it was for me to put the interior door handle on each time. Yep, the old light bulb went on in my head.
Even though these are original door panels, for some reason the inner door handle was being restricted by the cutout in the door panel. I had to trim a little of the plastic away from the top of the cutout, and magically my problem disappeared.
I'm just glad this problem didn't cost me any money for a change.
Mike