To get a good idea of the situation you should ideally just remove the pop up stopper and go from there.
Pop up sink drain stopper removal.
If it doesn t turn use pliers to remove the nut.
Put the drain stopper into place push the pop up stopper down into the drain opening inside the sink making sure the hole in the linkage is facing toward the back of the sink.
Sink and bathtub pop up drain stoppers diagram the flat slotted clevis is connected by a small spring clip to a pivot rod and ball assembly a rod that runs through a rubber pivot ball and slopes slightly upward to the tailpiece of the stopper.
Use the channel lock pliers to unscrew the large nut at the bottom of the sink.
Locate the nut on the sidewall of the drainpipe.
It may take some wiggling to extract the arm.
Most sink stopper tailpipes are made of pvc and will be connected to the drain with a pvc compression nut that you can loosen by hand.
Remove a sink pop up stopper the pop up stopper mechanism can become dislodged over time causing it to sit crookedly inside the sink drain.
Now that the bottom of the tailpipe if free from the p trap loosen the nut that connects it to the threaded bottom of the sink drain.
Beneath the sink use your hand or a pipe wrench to unscrew the connection where the tailpiece enters the drain.
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For a pop up drain assembly.
Insert the pivot rod into the opening in the side of the tailpiece from under the sink.
Usually there is a plastic washer on each side of the plastic ball.
This rod pushes the stopper up or lets it drop down into the drain body.
Normally all this requires is tinkering around with a few of the parts underneath the sink.
Carefully pull the drain stopper up from the drain opening and pull the entire rocker arm linkage from the drain opening.
Pull the washer and gasket down then push up on the tail piece to loosen the seal inside the sink.
Reach up with your hand to see if you can remove it by hand.