Several keys on a ring, and a small folding knife/file tool. My bike with padlocked Happy Trails bags and a Jesse top case and a small cable lock does not use just a single key. So it has a small wad of keys. So far no fish have been caught and no birds have been downed by this approach. Oh, and the Sun still comes up in the morning and sets at night.
Paul Glaves - "Big Bend", Texas U.S.A
"The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell