Has anyone taken apart a Pentax 6x7 meter prism before? Mine's been having power issues and my guess is there's something loose inside since my camera body's electrical contacts are fine. I managed to get the shutter dial and power switch off with a paper clip and I unscrewed the screws I could see. But I guess it's not that easy since the top wouldn't budge. Is it glued or are there more hidden screws somewhere? I had to give up and put it back together and it still works sometimes like it used to.