How can I replace trimmer line using the bump feed mechanism?

To replace trimmer line using the bump feed mechanism, follow these steps:

1. Turn off the trimmer and disconnect it from the power source.
2. Locate the bump feed knob on the trimmer head.
3. Press the tabs on the sides of the trimmer head to remove the spool.
4. Remove any remaining old trimmer line from the spool.
5. Cut a new piece of trimmer line to the appropriate length.
6. Insert the new trimmer line into the spool, following the arrows indicating the winding direction.
7. Place the spool back into the trimmer head and secure it by pressing until it clicks into place.
8. Test the trimmer to ensure the new line feeds properly when bumping the head on the ground.