Once again the Cinematheque is a community partner on a new film showing as part of the Cleveland International Film Festival. (This year’s 42nd festival runs April 4-15 at Tower City Cinemas and at various other locations around town.) Filmworker is a new documentary that profiles Leon Vitali, the actor who played Lord Bullingdon in Kubrick’s Barry Lyndon but who later abandoned his acting career to become Kubrick’s dedicated assistant. For more than two decades, Vitali worked behind the scenes to ensure that the great director maintained his legendary body of work.