Ian, can you elaborate a little? I can't get the knack of getting the knack. It seems no matter where I hold this thing, it causes the other side or the middle to open up, releasing its grip on the negative. I am used to holding the carrier firmly to either brush or blow dust off and examing it via a light. With this carrier, it is a bit like holding a fish. I can't imagine doing it with an 8x10 holder! Any tips?