My first knives didn't have choils at all. I didn't know what those funny little notches were for then. Once I started to sharpen my first knife, i realized what purpose they served immediately. So, i started putting them on my other knives (where it made sense). But, as always, once you start to get into something a little bit, you start to have more questions. I know i do. Here they are: 1. How big should a choil be? Is this just a preference thing? I started with a little notch, the size of my smalled chainsaw sharpener and it worked great on that, a smaller, knife. But if you have a bigger blade or if the angle of the edge goes really high, the choil should be biggger, shouldn't it? Are there general rules of thumb or common sense to consider? 2. I see some knives have a groove cut higher up than the handle for choking up on the knife. Is this consider a choil too? Can it be used as a choil for sharpening or should it be seperate so the fingers are further from the sharp edge. I just made my first big knife. It's a camp knife that has a big choil on the edge of the blade and also a seperate spot for the index finger when choking up on the knife. But it occured to me after that I could've combined the two things. Or could/should I ? 3. where, in relation to the plunge line, should the choil go. Is this also just preference or is there some logic to it? I see some knives where the plunge line is completely behind (toward the handle) the choil and the choil is completely within the blade's edge. Other knives the plunge line comes right to edge of the choil (on both sides) but that didn't seem right somehow. The one i've been doing, purely as a compromise in my head, is to file in the choil sort of in the middle of the choil (leaning more toward the tip side of the choil a bit - it seems better to my eye). I guess i'm just trying to figure out what makes sense in terms of functionality, aesthetics, history and common sense. I appreciate your advice but I'm also curious about all your opinions regarding what you think looks better. As always, thanks for the help. I appreciate it immensely.