Ah! Good information. Much thanks everyone. I shall obtain some Ilford Pan F and try it at the original range of exposure indexes. Nope, no pinholes in the bellows. I've got an Agfa Isolette with three or four holes in the bellows that I coated in liquid rubber insulator, so I knew what to look for in terms of light leaks. It's amazing to me that Kodak's bellows on both of their folders are like new when the Agfa's is relatively threadbare.