How do you replace string on sears bushwacker model number 31674520?

To replace the string on a Sears Bushwacker model number 31674520, first, ensure the trimmer is turned off and unplugged. Remove the spool from the trimmer head by pressing the tabs and pulling it out. Next, wind the new string (typically 0.065-inch diameter) onto the spool, making sure to follow the indicated winding direction, and then reassemble the spool back into the trimmer head. Finally, pull the string through the eyelets on the trimmer head and trim any excess length.