Hello JLS Leather, the model 16-188 was one of the first walking foot machines that Singer had. It is not a needle feed, meaning it is not a compound feed machine. It was designed to sew light to medium weight material(usually not more than 16 oz.), but when adjusted correctly, and the machine is not totally worn out, will make a nice stitch. The first thing that you will need to do is replace the bobbin case.Forget repairing it, or rebuilding it, just call Bob at Toledo Sew(1-866-362-7397) and replace it. Have Bob set the tension for 69/138 thread. When you receive your new bobbin case, then you will be able to adjust your top tension so that your stitch will do what you want it to do. Remember to start from scratch when it comes to adjusting the top tension. What I mean by that is to tighten the adjusting nut until it comes in contact with the tension spring, it looks like a beehive, then on some scratch material sew a couple of inches. You will probably find that there will be loops on the bottom. Tighten the top tension one full turn at a time until the stitch pulls up. Make sure that you do the regular things like clean out the hook assembly, remove any burrs that might be the cause of thread fraying, and oil it. This should help get you on your way. Thanks, Steve