I would not touch the metal !! If you do,,you lose many of your potential buyers !! As with all vintage items the less done the better !! Should the buyer want it shiny,, let them clean it after they purchase it !! It is not a big deal !! The wood part looked really worn and dry which might put potential bidders off !! With everything,,, do what is necessary without losing the integrity of the piece !! Buyers expect proper wiring !! I do all mine !!