I decided to sell the pretty-cool-but-not-right-for-the-house Crane Drexler ca. 1940. I hooked up the new hoses to the new copper supply lines and turned it on and it acted like it was possessed, rusty water squirting everywhere. I needed to fix this if I wanted to get good money for it.
Since the spout of the sink is integral to the sink body, the valve bodies themselves are sealed to the body and empty into a chamber that mixes hot and cold and then they water goes out the spout. The valves were leaking where they were sealed to the body.
So that's how you service a Drexel sink.