Replacing string on a trimmer can sometimes be frustrating. However, replacing string on your Ryobi weed trimmer is a straightforward and fairly uncomplicated process. Ryobi recommends using a string that has at least a .095 diameter. Purchase replacement trimmer string for your Ryobi at home improvement centers or Ryobi authorized dealers.
Unplug the Ryobi weed trimmer sparkplug wire from the sparkplug. Twist the boot of the wire that connects to the sparkplug with your fingers and pull the boot away from the sparkplug.
Grab the trimmer spool outer housing with one hand and turn the bump knob counterclockwise with your other hand. Remove the bump knob and pull out the inner spool from inside the outer housing with your fingers. A spring connects to the top of the inner spool. Leave the spring attached to the top of the inner spool.
Remove any remaining line from the inner spool. You may need to use needle-nose pliers to remove some line that adheres to the inside of the spool because of heat.
Cut a 25-foot piece of line from the stock .095 stock line with a pair of scissors. Fold the line in half and insert the two ends into the two line holes in the top of the inner spool. Pull the ends of the line through the holes so that the resulting loop is as small as possible.
Wind the line in even, tight layers in the direction indicated on the inner spool. Place your index finger between the two lines as you are winding to prevent the lines from overlapping each other. Continue winding until only 4 inches of line remain.
Insert the ends of the line into the notches on the top of the inner spool. The lines must be opposite each other. Insert the inner spool into the outer housing with the spring going into the housing first.
Guide the ends of the line through the two eyelets on the outer housing. Place the bump knob in place and turn the knob clockwise to secure the inner spool to the outer housing. Grab the ends of the line with both hands and pull straight out to disengage the line from the holding notches. Plug the sparkplug wire boot back over the sparkplug.