That's just the thing Rick, spring pressure between the top arm and the sliding doodad hold it closed, but there would have to be material between this bit when in wear. I suppose this would add to the tightness of the catch but it still seems like the kind of thing an engineering student comes up with for a project, fails and spends the next 5 years woking in a burger bar before sliding into petty crime and being shot by an angry householder during a burglary.