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