Power tool repair extends the life of your workshop gear. Cordless drills: battery contacts corrode, chucks wear, triggers fail. Brush replacement revives old motors. Our guides cover DeWalt, Milwaukee, Makita, and Ryobi. Unplug corded tools and remove batteries from cordless. Carbon brushes are consumable—replace when worn. Chuck replacement uses a reverse-thread screw. Battery packs can be rebuilt with new cells. Trigger switches and variable speed modules can fail. Match replacement parts to your model.