I have spent a lot of money on pencil sharpeners. I have four children who are avid artists. We go through a lot of pencil sharpeners. I thought electric ones were best because they were fast, but my kids ate up a lot of pencils with it, plus they never seem to sharpen straight. While I have long thought manual sharpeners are the best, it's hard to find one that you don't have to screw into a wall. A couple of weeks ago I dropped $20 at Staples on little manual sharpeners. And I lamented how the kids opened them up to empty them and dropped pencil shaving all over the floor. At my wits end, I Googled, "worlds best pencil sharpener" and found this: the Classroom Friendly Pencil Sharpener. The fact that there is no need to mount this sharpener had me interested. Plus, you can buy replacement blades. And for about $25, I figured it couldn't be as much of a waste as what I just bought at Staples. So, I ordered one, and I'm quite pleased with it.
You can check out the following link for info on how to remove the blade from the casing. I think I'd wear protective gloves just in case, unlike the person in the video.