There are a few I parted then later figured out how to fix. There is a huge learning curve that only experience can teach you. I think a lot of the old machines I pick up were given up on because someone else didn't know how to fix. Some times it is as easy as cleaning out lint, turning a needle around the right direction, setting the tensions, cleaning dried off oil, finding burrs, etc. Some times it can be a lot more complicated so set it aside for a day when you will know how to fix it or use it to keep another machine going. Let's not get judgmental at each other. Some times it is ok to take the machine to a shop and have it repaired if you are butt your head against the wall. If you are in over your head quit. Take some time out but before you go back to it search for information and see if you can apply that to the mess. Never let a sewing machine know you are in a hurry.