How do you replace the line on a stihl KM56RC Weedeater?

To replace the line on a Stihl KM56RC Weedeater, first, turn off the engine and disconnect the spark plug for safety. Remove the cutting head by unscrewing the knob at the bottom. Take off the spool and unwind any old line, then cut a new line to the desired length (typically 10-12 feet). Thread the new line through the spool holes, wind it tightly in the direction indicated, and reassemble the cutting head before reattaching it to the Weedeater.