What serendipity!
The very nuclear detonation fuses al Qaeda is looking for end up being shipped to potential intermediaries by Air Force Secretary Michael W. Wynne.
These fuses are harder to come by than the nuclear material itself. No one expects you to have one of these fuses; once you do, you make a deal for some nuclear material and then decide how you want to deliver it; on a missile, on a barge, in a truck, whatever.
There is no weapon mechanism in the world that is held under stricter security.
Suggestion ..