http://lawnandgarden.manualsonline.com/manuals/mfg/weed_eater/545117526.html?idRes=15826863
This link should let you obtain the manual for detailed instructions with photos.
To change the cord in a Weed Eater RT112, first, ensure the trimmer is unplugged or the battery is removed for safety. Remove the spool from the trimmer head by pressing the tabs and pulling it out. Then, take the new line, cut it to the desired length (usually about 10-12 feet), and insert it into the spool, winding it in the correct direction. Finally, reassemble the spool back into the trimmer head and ensure it’s securely in place before use.
To open the weed eater head to replace the trimmer line, first, locate the tabs on the side of the head. Press and hold these tabs while twisting the head counterclockwise to unlock it. Once unlocked, carefully remove the head to access the spool and replace the trimmer line.
If this is in fact an Echo SRM 210, then a manual is linked below.
Nylon
To load weed eater line on a Craftsman trimmer, first, turn off the trimmer and unplug it if it's electric. Remove the spool from the head by pressing the tabs and pulling it out. Cut a length of trimmer line (typically around 10-15 feet), then insert one end into the spool's eyelet and wind the line in the direction indicated by the arrow on the spool. Finally, replace the spool back into the trimmer head and pull the line to ensure it feeds properly.
A line trimmer, also known as a string trimmer, is used to trim grass or weeds. The piece of equipment also goes by the name of a weed eater, or weed whacker.
To replace the trimmer line on the Blade N1E-SPK-500, first, ensure the trimmer is turned off and unplugged. Remove the spool cover by pressing the tabs and take out the old line. Cut a new line to the manufacturer's specified length, then thread it through the spool and wind it tightly in the direction indicated on the spool. Finally, reassemble the spool and cover, ensuring everything is securely in place before using the trimmer.
To replace the line on your Ryobi gas trimmer, first remove the spool cover and take out the old line. Cut a new piece of trimmer line to the appropriate length and insert it into the spool. Wind the line evenly and securely onto the spool, then reassemble the trimmer.
To replace the line on your Ryobi battery-powered weed eater, follow these steps: Turn off the weed eater and disconnect the battery. Remove the spool cover by pressing the tabs on the sides. Take out the spool and remove any remaining line. Cut a new piece of trimmer line to the appropriate length. Insert the line into the spool following the arrows for direction. Reassemble the spool and cover, then reconnect the battery. Test the weed eater to ensure the line is working properly.
The best type of weed eater trimmer line for cutting through tough vegetation is a heavy-duty, twisted or serrated line with a thicker diameter. These types of trimmer lines are more durable and can easily cut through dense and tough vegetation.
To replace the line on a Ryobi RY15523A trimmer, follow these steps: Turn off the trimmer and disconnect the spark plug wire. Remove the spool from the trimmer head. Cut a length of replacement trimmer line. Insert the line into the trimmer head following the arrows for the correct direction. Wind the line evenly and tightly onto the spool. Reassemble the spool onto the trimmer head. Reconnect the spark plug wire and test the trimmer.
To replace the weed wacker line on a trimmer, first, turn off the trimmer and disconnect the power source. Then, remove the spool housing and take out the old line. Cut a new line to the appropriate length and thread it through the trimmer head following the arrows. Finally, secure the line in place and reassemble the trimmer.