If I get such a hub, would the modern S/A 3-speed trigger work for the older 3-speeds, and what might one use to shift the 4-speed variety in lieu of an original trigger?
Sheldon Brown wrote, in part:
> You might keep an eye out on eBay for an old Sturmey Archer FM, FC,
> AM, or AC hub. These were all made for 110 spacing, and were medium
> (FM, AM) and close (FC, AC) ratio. The "F"s were 4 speed, "A"s were
> 3 speed. See: http://sheldonbrown.com/sturmey-archer.html and