You know what? We tried lapping it in with valve grinding compound,
with toothpaste, and jeweler's rouge (not in that order), and it didn't
work. But the whack with the hammer stopped it from dripping.

Admittedly I don't know a whole lot about carburetors, and even less about
airplanes, but that doesn't make very much since to me. I'm not saying your
wrong, just that I'm having trouble understanding.