I do have an interesting question for Vruzend and Micah though.
I'm a new user too, so hi everybody!
For the spring material, couldn't we have used phosphor bronze C54400 19% IACS, beryllium copper C17530 38% IACS, or even better for the best compromise between conductivity and yield strength, BeCu C17200 22% IACS?
That last one is essentially very interesting since its yield strength, when heat treated and hardened, can reach a yield strength of almost that of stainless steel, while having 4-5x its conductivity. Having high yield strength, meaning resistance to plastic deformation is almost as good as steel, is what really matters in a spring.
All of the previously mentioned materials could be used, the highest performance one being BeCu C17530 38% IACS, having the highest yield strength relative to its conductivity, because using something like BeCu C17500 45% IACS would be tempting, but its yield strength is quite poor compared to all the other materials.
That would have made prototyping Matador's idea much more interesting, since you would not need to bypass the springs for high currents, and still retained high springyness.
Would be an interesting idea to implement if you could, as you could make a 10A capable version using BeCu/Phosphor Bronze, and a 20A capable version using nickel plated copper.