Any chances you still have the frame for the broken one? Or if you could send me pictures of it next to a ruler (happy enough making a temporary one out of card and tracing paper for general testing, and playing the waiting game for ebay. . .). Waiting to put a bid on some ziess Ikon slides that seem to be the right size (got seller to measure. . .) as it's a bit inconvenient having just the one darkslide with it, as considering cutting down some 70mm film to test the camera with. Happy enough with the camera itself though, just the fact that it didn't come with the back is a pain. . .