the nexus hub ive had use a cassette joint, the loose cable end is screwed clamped in place
all depends, the 3 speed stik shifts "click" into place (so do the nexus shifters), the 5 speeds were usually friction shifters for derailers. i dont know if the nexus hubs have equal "pull" between gears or if theyd line up with the standard "click" positions on the 3 speed stik shifters. the five speed shifters might work, but youd have to "fish" for the gear and then youd have to hope there was enough friction for the shifter to stay put without being pulled out of gear by the hub.
i think the main question is Whos done it?, and How did they do it ? :mrgreen: