How do you remove a broken bathtub drain stopper?
Set the drain to its open position. Unscrew the knob on the top of the drain stopper to see if there is a set-screw underneath. If your drain stopper has a set-screw, use a small screwdriver or a hex key to unscrew it. Twist the entire stopper counterclockwise until it pulls free from its mounting post.
Why can’t I unscrew my bathtub drain?
If the bathtub pop-up drain stopper is stuck and simply won’t unscrew, use a pair of pliers around the round cap to wiggle it loose. Placing a soft, thin cloth between the pliers and the top of the stopper can help prevent damage. Wiggle the stopper left and right and up and down to free it.