I have a 31-15 treadle that I'm restoring and a bunch of industrial needles that have been hanging around forever. I need to know what size needle to keep for the 31-15 and then I'm going to "re-home" the remainder of the needles as I only have the 31-15. No sense letting the rest of the needles sit. If someone can give me a hand I'd appreciate it. Most of the needles are Singer brand but many various sizes. An example is: 46X2 10 Twist; 16X97 11; 46X1 8; 16X87 22 Could go on forever but