BLACK&DECKER Carbon Brush ebay

Step 5: For tools and appliances that do not have easily accessible brushes, remove the motor housing to access the brushes. The lead wire from the brushes should be easily accessible on either side of the motor. Use a pair of needle-nose pliers to slide the lead wire clip off each spade connector. Depending on the design, remove the screw or slide over the tension clip holding the brush in place. Once accessible, remove the brushes, noting which direction they face.

Step 6: Replace the old brush with the new brush, reassemble the tool and test the equipment to make sure the problem has been solved.

The advantage of power tools carbon brush:
small spark
low noise
long life
Anti-electromagenetic interference
Safe and reliable
Reasonable price