I have an ancient sink [1945 edition] that I just installed and I just cannot get the cold water faucet to stop leaking. I have replaced the gasket seal twice, and the seat once. I also removed the sink and put teflon tape around it. Still no leak stop.
It is not a big leak, just a fairly steady drip.
Oh, yes, the faucet is the standard type with a screw in body and gasket at the bottom.