Alright well when you figure out the precise alloy of steel to optimize a spring for required specs, and the exact forging, quenching, and tempering processes and temperatures to use, as well as the specs for the equipment to extrude the wire and twist it into the right shape with enough precision to be commercially replicable, then we can all use your springs in all the things that we build. Now we just need someone else to build literally every other part.

The thing about a lot of modern technology, is that it’s made with other technology, which in turn requires still more technology. So when manufacturing capabilities disappear from a continent, it’s not so simple to just rebuild them. You need to rebuild the stuff that’s required to build them first.

And you also need technical knowledge, niche skill sets and tooling, and sources of often highly specific materials.

This isn’t meant to sound discouraging, but it’s best to understand the scale of the task from the outset.