... suppression in the permitted range, and the energy loss is small. (3) When carbon brush runs, no ... , the brush holders must be quartered. Quartering is setting the brush holders at equal distance around ... will be every 90 degrees. If the quartering is not properly set, you may experience excessive arcing, ... of opening. HITCACHI carbon brush,HITACHI 99-006,carbon brush for power tools,power tools carbon ...