Fixing a bathroom sink drain stopper that fails to pop up or move when you pull the vertical lift rod typically involves adjusting or reconnecting the mechanical linkage beneath the basin. Underneath your sink basin, look at the horizontal pivot rod extending out from the side of the vertical tailpiece pipe; this rod connects to a metal strap with spring clips. Over time, the thumb screw connecting the strap and rod can loosen, or the pivot ball clip can slip out of alignment, disconnecting the linkage. You can troubleshoot the mechanism easily by moving the strap manually. You can verify that your adjustment is successful when loosening the thumb screw, sliding the metal rod into the correct hole on the strap to restore full upward movement, and tightening it ensures the stopper pops up smoothly.
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