Ken;
I think you are right, it was all a matter of timing. Matter of fact I think Daryl was posting his while I was slowly 2-finger typing mine in. I read his right after I had posted.
What type of equipment do you use to check the hardness of a case hardened surface. In the machine shop I worked in we mostly checked Rockwell C scales & I don't believe the equipment we used would give an accurate reading or a case hardened surface.
No doubt though there is far more sophisticated equipment than we had although it was accurate on through hardened heat treated steel.
