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