1. Boss diameter of diamond end face grinding section has been changed from φ71 to φ81 (because φ71 has only 1.5mm grinded surface).2. The intersection of the raceway R and 50° taper is now within R0.3, and the intersection of the 50° taper and cylinder is within R0.5.3. The distance from the end face to the center of the groove has been changed from 12+/-0.005 to +/-0.01.4. R measuring range and contact angle measuring range are described.