Ray's class will teach you generic sewing machine repair which is what you want. That video someone is trying to sell will teach you some about various machines but you won't be able to figure out other machines. We are repairing a bit of everything in here. I've got quite a few done already and several of my machines are already repaired by other people. I brought enough that we won't run out of machines to work on - thanks for the idea Cathy. I'm getting ready to try my wings on a PGM (plastic garbage machine).