I have yet to see one in great shape that works right. Most people with one that looks great have neglected something or they would still be using it... I just fixed one with a tension someone took apart and reassembled with the disks spooned. I've seen the tension spring pulled around to the wrong side of the tension. I've seen very linty bobbin areas. You name it - those machines that 'look' good might have something you will need to fix... I love it - it is part of the puzzle.