I've just been told I need 16x113 needles for my coming 331k5 machine. First problem is they don't seem to be available in the UK, though are in the U.S. with attendant postage costing far more than the tiny item. But can anyone tell me, what is a 16x113 needle? Being a previously domestic only person, to me a 16 is a very small dainty needle, surely wrong in a machine designed to sew leather, albeit lightweight, and fabrics of uneven thickness. Are the industrial sizes completely different