To remove the spool from the trimmer, you will need a wrench or screwdriver to secure the gearbox shaft. Once secured, the cutting head unscrews very easily. However, there's a small nuance. Many people note that the spool doesn't unscrew or come off, but they are unaware that the spool and gearbox shaft have a left-handed thread. This means you need to unscrew the trimmer spool clockwise, not counterclockwise as we are usually accustomed to. Knowing this detail, you can easily remove the spool from the trimmer.