I picked up an old plate camera similar to a TP triple extention. The red bellows is actually in nice shape, but it is more like a cloth material than leather. It's not light-tight and you can see light seeping through the material. Is this normal for this type of camera? How hard is it to make your own replacement bellows? Also, the ground glass frame folds down over the back. But how the heck does a film holder stay in the back?... there is no spring or anything to hold it.