Accordingly, how do I unscrew a stuck sink drain?
Turn the locknut counterclockwise to remove it and release the flange from the sink. Tap the bottom of the sink drain flange from beneath the sink with the side of the pliers if the flange is stuck to the edge of the sink opening. This should loosen the grip on the flange and allow you to lift it from the sink.
Herein, how do you remove a sink strainer?