Thanks for all the help folks!
The above link to an earlier thread contains the trick to these hubs.
Unlike the other coasters that most of us are used to rebuilding, these hubs
have a slightly unusual reassemble which involves taking apart the brake arm side.
I did have to sort out one issue with the growling, grindy sounds that others also seemed to be having.
It went away after I backed the cone off about 1/8th turn looser than I'd usually set it.
Pretty awesome hub when it's all put back together !