It’s probably unusual for a teacher to prefer not to have a sharpener permanently installed. For the most part, I rely on handheld sharpeners in my classes. Even before I shifted to the manual sharpeners, I didn’t care for having a wall-mounted crank model permanently installed. My solution was to have a crank sharpener mounted to a concrete stepping stone. I used PC-11 epoxy to glue the sharpener and a couple of handles to the stone. I also added felt pads to the bottom. This solution allowed me to move the sharpener and even put it away when not needed.