Black & Decker is a popular manufacturer of corded and cordless power drills. These drills come with either a keyed or a keyless chuck to hold the bits securely while drilling. A keyed chuck has gears around the perimeter of the chuck, and a matching geared key is inserted into a hole on the side of the chuck to loosen or tighten the chuck. Conversely, a keyless chuck is loosened or tightened by holding the chuck securely. If the drill chuck becomes damaged, the chuck can be replaced in moments with some basic hand tools.
Rotate the collar on the chuck to widen the jaws to their widest point.
Insert an Allen wrench through the open jaws and into the base of the chuck. Turn the Allen wrench counter-clockwise and remove the screw.
Set the drill's direction indicator to "Reverse." Hold the chuck firmly with one hand, and depress the trigger with the other hand to loosen and remove the chuck from the drill's driveshaft.
Position the new chuck over the driveshaft and rotate the chuck clockwise until it is tight.
Switch the direction indicator to "Forward." Hold the chuck firmly with one hand, and depress the trigger with the other hand to tighten the chuck.
Rotate the collar on the chuck to widen the jaws to their widest point. Insert the screw into the hole inside the back of the chuck, and tighten with an Allen wrench.