No silverware, just a Klystron switch ... the secret for miniaturized thermonuclear weapons ...
Where do you go in NY to pick up one of those?
The Klystron is not a secret. It’s design is available everywhere. The neutron source for the grid is hard for non-nuclear countries to maintain in large quantities. I’ve always thought it pretty cool that we still (maybe) use vacuum tubes to ignite the low explosives in thermonuclear warheads. Kind of like how tube amps are preferred for good amplification and effects.