Warner part - What is it?

[lotsofmiles]

http://s873.photobucket.com/albums/ab291/lotsofmiles/?action=view&current=warner.jpg

http://s873.photobucket.com/albums/ab291/lotsofmiles/?action=view&current=warner2.jpg

lever moves up&down. Also says Warner on the end of the lever knob thingy.