> I have seen 3 cogs on a threaded driver, but it was a long
> time ago. I think those were part of a factory Cyclo
> conversion kit that included the derailleur, shift lever,
> and cable set.
I have a three-cog unit for the 3-slot driver that I got on eBay, as well as the two-cog unit used on my 1962 Raleigh Lenton Sports "convertible" http://www.wallbike.com/
The range of the Cyclo-Benelux derailleur is limited by an extra collar fitted to the shaft inside the big springy thing, something I will have to fabricate for a standard 4/5-speed unit to use with my 3-cog!
Alan Lloyd
Schaumburg, Illinois, U.S.A.