To install the brush assembly to the field frame, first, install the brushes to their holders and then assemble the insulated and grounded brush holders together with the V-spring and locate the unit on its support pin. Push the holders and spring to the bottom of the support and rotate the spring to engage the V in the support slot. Connect the ground wire to the ground brush and the field lead wire to the insulated brush and repeat the operations for the second set. Smear silicone oil onto the drive end of the armature shaft and slide the clutch assembly (pinion to the front) onto the shaft, followed by sliding the pinion stop/retainer onto the shaft with its open end facing away from the pinion. Stand the armature vertically on a piece of wood, position the snap-ring on the end of the shaft, and using a hammer and a piece of hardwood, drive the snap-ring onto the shaft. Slide the snap-ring until it drops into its groove. Install the thrust collar on the shaft so that the shoulder is next to the snap-ring and use pliers to squeeze the thrust collar and stop/retainer together until the snap-ring fully enters the retainer.