C4 Maintenance 9. Joint #5128 C Series Maintenance Manual Rev.24. Install the removed bearing to the Arm #5.5. Install the O-ring (of the Joint #5 reduction gear unit) tothe housing.O-ring6. Install the flexspline so that the hole on the inner side canmatch the bearing’s outer ring.Hexagon socket head cap bolts: 6-M3×8Tightening torque: 2.5 N·m (25 kgf·cm)Bearing outer ring7. Install the circular spline.Hexagon socket head cap bolts: 3-M2×10