I'm actually not terribly surprised to find out that the India springs are hand-made out of actual steel. As long as they are using carbon steel for their efforts, they should be very good. Sintered metal and castings have high tooling costs but make up for it in volume manufacturing. The Indians have cheap skilled labor so they do not need to move to the more efficient manufacturing techniques. As a result they are producing a more accurate, and higher quality product in that regard.