Odd construction.
Best I can tell, the left rear brake cable is routed externally with housing the whole length.
The shifter cables, however, are installed internally.
Originally Posted by
Crankycrank
I could be wrong but doesn't the cable stop in the BB shell pop out? This could give you more access to see where the problem is.
That would be my first step, see what could be popped off or unscrewed for better access.
One can measure how much cable goes in to determine where it is getting stuck.
Assuming some kind of factory internal housing, perhaps it can be punched out with a stiff wire. I'm not sure where one would get a real stiff wire, but perhaps a choke cable from an auto parts store.