I'm picky about my fixed blade knives. My favorites are a Bradford anything, the TOPS C.A.T., and the Coye. I cannot afford a real Coye, but he has offered a licensed copy one cannot tell from the real deal.
Now, these last knives I bought (a Spline, a Barge and a Coye) were all to be my personal knives). I usually use them for a bit, dull them, and then make a more knowledgeable opinion on improvements. I checked over my Coye, and found I desperately needed a choil and that there was a flat spot about 3/8 inch from the tip.
Since the edge would have to be made uniform front to back and then left to right, I needed to get any stone flat to the bevel. Since the grinder eased the wheel into the blank near the ricasso, he left an uneven area that had to be removed.
Since I'd done one of these before, I knew I needed round diamond files and a method for getting as close to the ugly part as I could. I use a CRKT serration sharpener, cut a slot with the smallest file (pushing down and to the rear at the same time) until a large enough divot will hold the second size diamond rod.
This takes out the complete grinding error. Yeah, it's picky. But you can tell a lot about a polisher on how he finishes the ricasso transition.
The last picture shows the divot half done.