Are you referring to the divot that extends from the top guard halfway across the top of the blade?Congrats bearcut! I've always liked the looks of this knife, but haven't heard much about it. I like the 5" blade and steel buttcap. What is the purpose of the hump on the blade
That is a thumb rest for use when choking up. It is perfectly designed and very comfortable for this.
RPW did a really good job with egos and design on this blade. It is easily the most comfortable HH I've ever had. Heck, it has the most comfortable handle of any steel handle knive I've ever had, HH or not. There isn't much you can do to a round tube handle to make it any better than the rest I guess.
I've thought about cord wrapping the handle on the RPW but I'm really not sure it would make it any more comfortable, in fact, it might make it less comfortable, and more prone to giving blisters. The handle seems that good. However, I haven't used it hard yet so I might change my tune on the whole thing!
I still haven't stuffed the hande, but I have noticed that it is deeper than most hh's I've had, especially smaller ones. The bore extends a little over 3.5" to the end of the butt. This is due to the bore extending into the guard area. Since the buttcap has no compass, and is also hollow, the cavity is close to 4".