I recently bought three Astra 4x5 Film Holders in the UK, which were made by Fidelity Manufacturing Co. Burbank CA USA. <p> One of the holders is missing a "slide" (I'm not sure if that is what it is called - I haven't seen actually 4x5 film holders before - I intend to use them in a pinhole camera that I'm making). Each of the other two holders contains two "slides". <p> Does Fidelity still manufacture film holders? If not, do you know where else I might be able to obtain a replacement?