A) forming a race containing {TAIL ~ a plurality} of balls and a hole, wherein {HEAD ~ a burr} is formed on the hole protruding outwards 
A ) forming a race containing { TAIL ~ a plurality } of balls and a hole , wherein { HEAD ~ a burr } is formed on the hole protruding outwards
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH