Thank you to those that came up with this and a special thanks for the above photo. I forgot to take one as I was disassembling mine.
I found an easier method to hold the lower of the three pieces up while reattaching them together, thread. I took a long length, about 20" or so and taped it to the rear surface of the unit. I then threaded through the little slot on the end opposite the screw and then back under the raised area where the screw goes. I taped the free end to the back of the unit as well. I inserted the lower metal piece through the opening and kept hold of the thread "loop" that was on the side towards the front of the radio. Keeping tension on the thread kept the piece up and allowed me to add the black plastic disk, insert the top metal part and then screw the assembly together.
I quick test showed that it is, at least for now, back to a working state.
Again, thanks all.
Speed costs money, how slow do you want to go?