Originally Posted by
Peckish
Have you tried placing baking soda or charcoal inside for a week or so? Maybe leave it sitting open in the sun for a couple of days?
I don't have a featherweight but I know those cases are notorious for stinking to high heaven. It's the old hide glue in them.
I may be wrong, but I don't think there's much you can do to de-stink them.