For very delicate work, such as opening and closing small chain jumprings, for example, it’s sometimes necessary to have very pointy chain nose pliers. Infortunately, this kind of pliers is not always easy to find or it can be expensive.
An easy way to work around that problem is to file the tip of cheaper pliers until you get a thinner tip. With a rough file, you file around the outside of the pliers (and only the outside) until it tappers to a sharp tip. Easy!
You can see the result on the left side pliers, in the pictures above.