My friend asked me to fix her BL/Juki 436 a few days ago because it is frozen. She hasn't used it in years! I cleaned out all the fluff and put about 20 drops of oil in the furthest up hole, then oiled all the metal/metal parts sparingly. It groans loudly and turns over very slowly - I'm afraid to push it much, because I don't want to burn out the motor. I've never worked on serger before and don't know how to get inside, or what to look at if I do. Can you give me any suggestions? The only thing I can think of now is taking it to a fix-it guy, and that would probably cost $100 or more. Thanks in advance!