I've been looking all over Copenhagen to source Flagline but alas it's not something that is readily available. Luckily, a fellow Danish student, Elina, had worked with another student who worked with flagline before (At the bottom of this page). He had sourced it from the factory, Århus Possementfabrik A/S. Unfortunately I called but they are on summer vacation.
[Update 8/17/2011: They contacted me back! But alas the project is done.]