Reassemble and Test

What happens here

Now, reassemble the drain stopper mechanism. Insert the cleaned and modified pop-up stopper into the drain from the top of the sink. Ensure the notch or flat side of the stopper is facing towards the back of the sink. From under the sink, take the horizontal linkage bar and insert it back into the hole in the pop-up rod assembly. Finally, reattach the retaining clip to secure the linkage bar in place. Push the clip until it's fully seated and holds the bar firmly. Test the drain stopper by pushing and pulling the handle on the faucet to ensure it opens and closes the drain properly.

Goal: Reinstall the pop-up rod assembly and verify functionality