{HEAD ~ The balls} are seated in each race, and oil is supplied to the inside of each race through {TAIL ~ a hole} formed thereon 
{ HEAD ~ The balls } are seated in each race , and oil is supplied to the inside of each race through { TAIL ~ a hole } formed thereon
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH