The race 320 extends and converges in {HEAD ~ width} from the second end surface 312 b to {TAIL ~ the vertical notch surface} 318 b 
The race 320 extends and converges in { HEAD ~ width } from the second end surface 312 b to { TAIL ~ the vertical notch surface } 318 b
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH