... safety HITCACHI carbon brush,HITACHI 99-012,carbon brush for power tools,power tools carbon brush,carbon brush replacement Size6.3X8X16/18Code No.99 ... psi)Brush Holder Quartering:To insure that the best machine electrical neutral can be achieved, the brush holders must be quartered ... machine performance, the brush must be set at the machine electrical neutral. If the unit is off neutral, you may observe ...