Originally Posted by
McDave
Maybe it's time to insert some meta name tags like "Sheldon Brown" in the hope they Google search this site for requests for their assistance.
Know any other likely experts?
I'll behave myself. I came across some info on 'sport' helicomatics that use a 'larger' lock ring. 'Sport' models are identifed by 1/4" bearings upon disassembly. It seems the larger gear body may be for a 'sport' hub.
I'm still researching....