Here's your fix for the day:
Original Clutch Plate. (Can you tell what's wrong with it?)
Grind Off the Rivits. Don't grind and breath asbestos.
Pull out little center hub.
Nice Hub.
The smaller, machined edge measures just a tad under one inch. As best I can measure, it is 31/32. The back side is a little bigger and has lots of teeny-tiny spot welds.
Now, everyone else run out and do the same.