Begin by unplugging the Elmer's Crayon Pro sharpener from the wall.
Next, remove the crayon shavings receptacle and turn the sharpener over to access the blue blade cartridge inside the sharpener cover.
To remove the blade cartridge, rotate the black thumbwheel by hand until the protruding end of the red release button is facing out.
Press the release button, slide the blue cartridge towards the rear of the unit, and lift it out.
Next, insert the new cartridge carefully by placing the side with the keyway into the black thumbwheel and sliding it toward the front of the unit until the cartridge engages with the hole in the inside cover. Then pull straight up until you hear a click.
Securely lock the cartridge in place by rotating the thumbwheel to the other side and pressing the red lock button. Remember to press the red lock button as it's a step that can easily be overlooked.
When finished, turn the sharpener upright, set it firmly on a flat surface using its suction cup feet and plug the sharpener back into the wall.
How to replace the cartridge on the Elmers Crayon Pro sharpener.