I just got a Speed King on the bay; the pedal itself is in great shape but the beater assembly is missing the bottom plate/flange so the wool beater itself falls down. It's obviously unusable as it is, and I would like to use this one because the beater is softer, plus it's original. I have some ideas on how to fix it but if anyone has any ideas, fire them at me.
One thing I was thinking was a washer and some kind of ring with a set screw to hold it securely in place....