When Free Isn't a Deal

My recent Lomo Diana Purchase came with a 'free' telephoto lens.  However, there was  viewfinder adaptor, but no viewfinder.  I contacted them and was told that's how it is.......No wonder they are giving them away!

So How am I supposed to frame my image?  I guess I could attach one of my Mamiya viewfinders, but that just seems wrong!  When Free Really Isn't a Deal.........