I have an old Miami Sun tricycle I'm working on. It has a Shimano 3 speed hub with coaster brake. The trike has been stretched and the shifter mounted by the seat rather than on the handle bars. Basically, I tried to shorten the cable length without fully understanding how the shifter works ( I know now). The cable housing has built in ends that attach to the shifter and the hub. One of these ends is now disconnected, because I cut it. How could I go about replacing or fixing this problem? Are these cables still sold?