...and there is more... operators standing by...
There is a cerated spot on the "variable / fine sweep" shaft where the washer supposed to be,
have no idea how I managed to pull the shaft out and reinsert it with the washer still on it!
Anyway it is now back in correct space and guess what - there must be some kind of spring INSIDE the wafer assembly because now it springs back when released.
Still does not turn the shaft!
I wish I could post pictures here.