I've been working on an old industrial machine I gave up on this spring. I got the tension fixed! It still wouldn't stitch. It came with two bobbin cases. One was missing a screw and the other wouldn't go in the hole. Then the thread didn't line up with the needle area. I stole a screw off another one and jiggled with it a bunch and low and behold it pulled up the bobbin thread!!!!! Now I have to get her to actually work on fabric, get her presentable and find someone who wants her. She is a Singer 241 - she has a beautiful table. Motor sounds and runs perfect.