Lived and breathed slot cars from about 10yr old. I was on a "travel team" subsidized by a local hobby shop. I wound my own armatures, ground magnets, made my own tires using silicon bathtub caulking in a mold. 50yr later I still have my old hand controller and one 1/24 stock car that I keep for nostalgia.
I did not realize it was so high tech now, rebuilding motors after a race, crazy!!