I usually just replace it, but for my slow-as-molasses Dawes restoration I'm planning to re-use the original housing because it's in good shape. Newer stuff would work better, but it's kind of cool for the bike to have the same housing it had when it left the factory in Birmingham in 1964. In fact, I'm thinking I can even reuse the original white plastic bar tape--unwind it, give it a good wash, and put it back on. We'll see how that works out.