Prepare the Plastic Washers

What happens here

To address the unthreaded gap, retrieve a plastic washer (specifically, one typically used for toilet installations, ensuring it is new and clean). Using a sharp utility knife, carefully widen the center hole of the plastic washer. This modification allows the washer to slide over the threaded brass post of the tub stopper. The goal is to make the hole just large enough for the washer to fit without being too loose, creating a snug fit around the post.

Goal: Modify washers to fit the stopper's threaded post