I too am the proud owner of a Standard Treadle. If yours is like mine a class 15 metal bobbin will work. I do have original bobbins that came with my machine but prefer using a class 15 since they are easier to wind. You are going to go 1 and 1/2 times around the tension disk when you thread it and the needle threads left to right. The hand wheel will go away from you to get it started. I have a manual that I can copy if it is the same machine and you need one. I have pieced quite a few quilt tops on mine, it is a fun little machine to use.