Greetings, I've several Canon lens cases (C & D models) that need to have the foam replaced. The cases themselves are in great shape, just the foam is shot and literally disintegrating. I'd hate to have to ditch them if I can replace the padding instead. I can probably pick up foam from a craft store or someplace that does upholstery if needed. A quick google search found one post from a few years ago that mentioned some types of foam releasing a gas that was bad for the lens coatings (polyurethane I think), but otherwise no real useful info. Any suggestions?