Replace / Install new string trimmer line - single line Makita XRU02Z weed whacker - YouTube
Makita LXT 18V Cordless Power Head Kit(4.0Ah)w/String Trimmer and Pole Saw w/Bonus Leaf Blower,Hedge Trim,Chain Saw(Tools-Only) X2SM14B3ZH2ZC6Z - The Home Depot
Makita 18V LXT Couple Shaft Power Head Kit with 13" String Trimmer & Blower Attachments Lithium Ion Brushless Cordless XUX02SM1X3 from Makita - Acme Tools