View Video • Changing the blade cartridge on your X-ACTO rotary trimmer is an easy process because of our patented protected blade changing system. • Begin by turning the blade cartridge counterclockwise toward the open circle icon. • Carefully and slowly pull the blade cartridge toward you to remove. • Insert the new blade cartridge by aligning the dot on the blade cartridge with the open circle icon on the blade handle. • Turn the blade cartridge clockwise toward the dot to lock it into place and your X-ACTO rotary trimmer will be back to trimming 10 sheets at a time. • Last but not least, properly dispose of the old blade in a nearby trash receptacle.