... power tools,power tools carbon brush,carbon brush replacement Size4.7X8X12/13Code No.99-006For ModelBUW-SH, ... change color carbon brush‘s body, no ablation. (4) During the running, It can make the surface ... , we recommend that the brushes be set at 4 psi pressure. To calculate the pressure, measure the ... Pressure in Pounds/Brush = (Width x Thickness x 4 psi)Brush Holder Quartering:To insure that the best ...