This evening, I decided to open my only Helicomatic hub's freewheel, and to look through a bag full of cogs that had been given to me as helicomatic. (anyone need spare cogs? cheap?)
Meanwhile, the bag had some other cogs that I could not imediately identify, and would love to challenge the collective wisdom (and knowledge of deep trivia):
--> one cog (new) that looks like a set of 12 wave crests on the inside. Biggest ID is 50 mm. some teeth have slight twist. --> stack of cogs (new) with 4 inward pointing square-edged tabs, fairly wide. These slip onto 39 mm core. --> some 3-tab rounded cogs, but they are about 49.5 mm inner dia, a bit smaller than the late Normandy/Atom I checked. That hub was designed for the splined tool that slipped over the QR, simplifying removal.
Let me know off-list if you need any of these beasts of burden.
thanks
harvey sachs
mcLean va