Yeah... pictures.....left handed sandpaper and etch-primer the outside. Plug some tubes and fill it up with cheap soda from the local discount food store... the kind that has phosphoric acid in it! After a few days the rust inside will go away. Then rinse with water via a water hose. Then rinse with acetone or lacquer thinner. Then blow compressed air through it to dry it out. Then pour some Marvel Mystery oil in it, slosh it around and pour that out into a container and use it to clean other parts. Done with innards!