... 20A,HUS,2,3,4,5,HUS-ORN,2,3,HC-3,KS-4,HS-4,HUJ-RN,KBM-600 ... ,LDU2,3,4,LDU-4,LA12,NDU,PD-100, ... 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 ... in Pounds/Brush = (Width x Thickness x 4 psi)Brush Holder Quartering:To insure that the best ...