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