Turn off the weedeater and disconnect the spark plug or battery
Remove the spool cover
Take out the spool
Remove any remaining old line
Cut the new trimmer line to the correct length
Insert the line into the spool’s anchor hole
Wind the line evenly in the direction shown on the spool
Leave the required amount of line free at the ends
Thread the line ends through the spool eyelets or slots
Reinstall the spool into the head
Replace the spool cover
Pull the line ends to confirm they feed correctly
Reconnect the spark plug or battery
Test the weedeater briefly