There's two of 'em, both on the RHS (3&4). The tips and electrodes are fine and a nice tan colour but what's going on with this crust on the outside? Cylinders 1&2 are fine. [URL="http://www.whingingcourier.dsl.pipex.com/DSC00074.JPG"]www.whingingcourier.dsl.pipex.com/DSC00074.JPG[/URL]