Disassemble Old Pop-Up Mechanism

What happens here

After removing the stopper, inspect under the sink. The video reveals a leak at the pop-up mechanism linkage. To fully remove the pop-up stopper, you'll need to unscrew the retaining nut and linkage rod located on the underside of the sink drain. Use a screwdriver to loosen and remove this nut. While unscrewing, ensure you hold the top of the pop-up stopper to prevent it from spinning. Once the linkage is disconnected, pull the pop-up stopper completely out from the top of the sink. Inspect the removed stopper and the linkage for heavy buildup, corrosion, or damage, noting their deteriorated condition.

Goal: Fully remove the old pop-up stopper and linkage to inspect the drain for clogs and damage.