Scooper

Bill, that's my guess. A previous owner thought internal cable routing for the rear brake cable looked cool and decided to take it on as a project. The question I have is did the modification involve installing an internal tube in the TT connecting the entry and exit holes, or is it just the entry and exit holes drilled for the cable? The former option is typically used by framebuilders to prevent the cable from flopping around inside the top tube as well as preventing water from getting into the frame; it also makes cable replacement easier.

This is Darrell McCulloch's internal routing on a steel frame.