Remove the contents in the cabinet below the sink, then place a paint tray under the sink to catch any water drips.
Remove the nut by connecting the top of the vertical metal strap to the lift rod running into the bottom of the sink. The strap is a long, flat metal piece with several holes in it.
Remove the strap, along with the clip, from the horizontal pop-up rod, running into the vertical drain pipe below the sink.
Unscrew and remove the pivot nut, connecting the lift rod to the drain pipe just below the sink.
Remove the rod and plastic inserts from the drain pipe below the sink.
Pull the pop-up valve out of the top of the drain.