Worked on one for several hours yesterday. The presser foot was "frozen." Sewing machine oil, slight pressure, time, repeat, repeat again, and again, and again. Patience and persistence, and it finally started to give. Have gotten many machines working that way. Most of the ones I have were free, or close to it, because they were non functional. Now, they are fully functional and in sewing service. Do not use 3-in-one or WD-40, or any thing other than sewing machine oil or kerosene. I've been told that it may free the mechanism, but it will then dry up and make matters worse.