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.
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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
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 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.
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.
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 restring a Ryobi Expand-It weed eater, first remove the spool from the trimmer head. Cut a length of new trimmer line, usually around 10 feet. Insert the line into the spool following the arrows for the correct winding direction. Secure the line in the notches on the spool and reassemble the spool onto the trimmer head.
To restring a Ryobi 2-cycle weed eater, first remove the spool from the trimmer head. Cut a length of new trimmer line, usually around 10 feet. Insert the line into the spool, following the arrows for the correct winding direction. Secure the line in the notches on the spool. Reattach the spool to the trimmer head and feed the line through the eyelets. Trim any excess line and you're ready to use your weed eater.
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.
To replace a line in a Ryobi trimmer head, first, remove the spool from the trimmer head. Then, unwind any remaining line and clean the spool. Cut a new piece of trimmer line to the appropriate length and insert it into the spool, following the arrows for the correct winding direction. Finally, reassemble the spool back into the trimmer head.