Remove the stopper from the sink drain
Check for hair, soap scum, and debris
Clean the stopper and drain opening
Tighten the pivot rod nut under the sink
Reconnect the pivot rod to the stopper
Adjust the clevis strap if the stopper is too high or too low
Replace worn washers or gaskets
Reinstall the stopper and test the lift rod
Apply plumber’s grease to moving parts if needed
Replace the stopper assembly if it is damaged or broken