Thinking of adding one to my arsenal. Couple of reasons. I think it’s a safer way to touch up broad heads. And it seems like the better option for black coated blades. Me with a free-hand stone would wander into the black more often than not. Here is the que: the sharpening angle. It can’t be accurate with blades of various heights. Let’s take some extremes as an example. A Chinese cleaver. It’s 4” tall. No way the 20 deg hole will give you 20. I know pethgoreans theorem. . Over thinking this?