Well I'm going to get a couple new holders to see if its just the wooden Kodak ones that don't fit right. There is no obvious warpage on the camera back where the holder would sit, but then the leak isn't profound either...just apparent. When I was doing the test with the flashlight and hit the right spot, a little light would show through. Then when I adjusted the holder and did the light test again, there was no leak. So I'm pretty sure its dependent on how it's sitting in there. Whethere thats due to the brand or holder or slight warpage in the camera back, I don't know. Time and further tests will tell.