After an aborted attempt to get the hub gearing up and running on Thursday, I managed to get the final components today and set up the Superbe for a test of the shifter and hub mechanics. So far so good. I can get the indicator chain to pull all three gears, but (and its a big one) I can only get “top” and “normal” to activate with the lever. I suspect the cable is too long and I need to make another adjustment.
Meanwhile I’ve taken the old saddle and stem off the bike and will be cleaning that mess up next.