I have a 94 Stumpjumper and welded on the seat tube is a noodle that guides the brake around the seat post. When I got the bike it has pieces of plastic liner in there. I don't know if the liner is supposed to be there, or if it was part of some sheathing that was degrading and covering the housing free section across the top tube. anyway it had to come out because it was jammed in there. This noodle seams to be a source of considerable friction. Does anyone know if there is supposed to be a liner in there, is so where do I get a replacement. This picture is similar to my 94 but purple.