As for as the pressure foot lever stuck I use Blast Buster. I take the cover off the front and soak it good and let it sit for several hours. Don't use heat with blast buster. If it is still stuck spray again. We don't want to force it and break the thing. You can tap it to vibrate the stuff into unit to speed the process. Don't hit it hard you just want to cause a vibration by quickly tapping it lightly. This works better than kerosine for me.