My kenmore is 40 years old. It works great, but i cant seem to do free motion quilting on it. It has a darning feature, and i can drop the feed dogs, but i dont have a darning foot. I am thinking of trying to buy a darning foot for it. I've tried it without a darning foot, and wont work. I wonder if i can buy just a darning foot and what they cost? Maybe i wil look online.