Thanks shimmilou! Yeah, I am getting the same measurements when I try to measure the 85\15 'S' p-ups but Philadelphia Luthier Tools has 49.2mm & 50mm, (plus 48, 51, 52 & 53mm to boot) and I can't get that accurate. How do you feel the tone of the 85\15 'S' p-ups vary against the SD JB\Jazz set...