Orange thread, cool The bobbin will fit in the bobbin winder mounted on the front of the pillar The end without the belt pulley should slide towards the needle to let you slip the bobbin in . There are holes for the bumps on the ends. Belts surprisingly can still be found at many modern Sewing machines shops, but you will have to fit it to your machine. shape, measure, cut and punch a hole for the staple. A bit intimidating, but we can walk you through it when you are ready. Your 200xxxx # on the slide is your serial #.