Swing Arm Bearing Kit 28-1137A Quality Swing Arm Repair Kit from All Balls Racing. Bushings are case hardened and plated to prevent wear and corrosion. POM composite washer bearings replace thrust needle washers for susperior resistance to water and dirt and increase service life. Shafts are made from 52100 Bearing steel, through hardened and precision ground. Needle Bearings are made from 52100 bearing steel and ARC61 65 heat treated ST13 steel shell.