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Location: Bozeman
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Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2
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Replace cables and housings.
You're only (real) choice. Everything else is a bodge.
It's not hard to do really. It depends on the type of internal routing you have.
If your cable is bare inside the frame, then the bike will have removable plastic pieces which will allow you to easily "catch" the wire inside the frame. Or, when you pull the old cable out you can tie a string to the end of it. Then you use that string to pull the new cable through the other way.
If the bike has full internal housing, then you pull the cable out, replace the cable, then pull the housing out (the opposite direction) (while keeping the cable in the frame) and then thread the new housing onto the cable in the frame. The cable then acts as the guide for the housing.