How do I remove the head of a Ryobi Expand-It weed eater?

To remove the head of a Ryobi Expand-It weed eater, you typically need to unscrew the bump knob or cap on the head of the trimmer. Once the knob is removed, you can access the spool and remove it from the head. This allows you to detach the head from the weed eater for maintenance or replacement.