When restoring a kettle, I usually polish the lid vent after it has been cleaned with steel wool. In the past, this created a mess on the porcelain around the vent. Don't know why I didn't think of this before. Cut a sheet of paper in half and work it beneath the lid vent. This keeps the polish from getting beneath the lid vent and all over the porcelain. It also keeps the lid vent from turning while polishing. If the lid vent is tight like this one was, the lid vent can be lifted slightly with the blade of small screwdriver. This allows the paper to be slid beneath it. To protect the porcelain, I layed a cloth on the porcelain so the screwdriver is not actually touching the porcelain. Saves a lot of clean up and detail work.