Yes, I'm sure several have, me included. I just dont have the pics.
I use about 5/16 round brass rod held firmly horizontal. Some guys JB Weld it into a board with about half of it exposed. You lay your blade perpendicular to the rod with the cutting edge laying almost as if you are going to try to shave the rod. Press down and slide it across. The goal is to actually see the distortion in the cutting edge as it flows over the rod. You will need a light on a low angle to see the distortion. If the edge bends (not flex), it's too soft. If the edge chips, it's too hard. If the edge flexes and returns, it's good. This is just a rough rundown and not accurate instructions, but it gives you the idea untill we have something better to go by. Lin