{TAIL ~ Tighter control} of {HEAD ~ the preload} therefore results in longer service life with a higher level of operating precision 
{ TAIL ~ Tighter control } of { HEAD ~ the preload } therefore results in longer service life with a higher level of operating precision
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH