Originally Posted by
bulgie
Actually I think the original way was not step-down ferrules, just regular single-diameter ferrules but much smaller. Maybe not made anymore (I'm way out of touch with the current offerings) but I have some ancient Simplex housing and ferrules and they're tiny by modern standards.
One reasonable way to git 'er done is to use regular spiral-wound housing with no ferrule, just grind the ends nice and flat and de-burr the holes. Maybe not as finished a look as a proper ferrule, but functionally just fine as long as the diameter matches up so the housing is guided in straight.
Mark B
For sure the old Simplex mech's do not need ferrules.
With the ferrules removed, the housing might seat sufficiently better so as to make good with that actual piece of housing.
But having a correct step-down ferrule at the chainstay stop might really improve the cable path if it holds the housing in line with the cable.