From what I've read, the smell comes from the oil that drips from the machine onto the inside of the case. Be sure you have replaced the felt bottom that is on the underside of your Featherweight. You can order these. I washed the inside of my case very well with a household cleaner, then put charcoal in it and closed it for a couple of days. Then sat it outside for a couple of sunny days. Most of the odor went away.