That bike originally had a scrub brake , so all you see I made and welded on the frame , the idler / tensioner wheel was also added , I made it with a skateboard wheel , I turned it on a lathe to cut a groove in it , It's not needed but makes life a whole lot easier , one bolt to loosen , slide it back a bit and chain is tight again !! not sure what lever you're talking about ? the arm that is on the drum brake ? if so I guess you could make one ?? good Luck