I brush all those parts with kerosene. Let it stand a bit, than try to move the wheel, even just a little bit. Then brush it again with the kerosene. Let it stand a while, then repeat. Worked on the most stubborn of the machines that I restored. Just have patience and work in a ventilated area. Remember, kerosene is flammable! After you get it freed up, you can oil it with sewing machine oil. Pretty machine!