In this video, we learn how to replace the line on a STIHL trimmer head. First, remove the spool from the head by stopping the engine and cutting attachment first. Then, grasp the body and insert your thumb into the tab on the head, then rotate around and press on the second tab. After this, press down on the spool and release it from the housing. Now, remove the star nut to remove the head completely. Now, you can replace it with a new one. After this, replace the parts that you took out and wipe them off as you are doing this. When finished, secure all edges and you're finished.