Well I did the measurements on the existing freehub body (apologies for ragged ruler, but the backside is filed pretty accurately). Pictures below.
Seems it is 3.8mm and 4.1mm -- indicating it might be another variant of the measures provided by MrRabbit... sort of a 6/7 speed body with thicker than normal spline stops?? Pretty sure it is a real Shimano HF05 hub, but who knows what year it was actually built?
Anyone have ideas one way or the other? If it werent a fairly expensive item to replace, I might file back the spline stops by 1.5mm and retest the SRAM-9 cogset to see if I can get an adequate spline capture for all the cogs... or "8 of 9 on a 9"
