I dismantled the rear hub ... which has a large ring on each side (it's just pressed on) ...
So when I tapped the ring off ... I discovered (to my delight!) that it was almost the identical size of the AN970 Washers that I bought from Aircraft Spruce.
I just laid the ring on the washer ... used one of those fine point Sharpie markers thru each of the spoke holes ... giving me a washer like the one on the bottom. Then I used a needle punch to mark them for drilling.
Hey! This is progress!