The undercut groove 323 is coplanar with the bottom surface of the race 320 and extends {HEAD ~ a depth “DG}” into {TAIL ~ the transverse side wall 321 b} 
The undercut groove 323 is coplanar with the bottom surface of the race 320 and extends { HEAD ~ a depth “ DG } ” into { TAIL ~ the transverse side wall 321 b }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL