A frictionless plastic bearing material is not only interposed between the metal plates with its opposite sides engaging opposite plates for {HEAD ~ bearing} and spacing purposes but is also curved arcuately to conform to {TAIL ~ the circular curvature} of the race 
A frictionless plastic bearing material is not only interposed between the metal plates with its opposite sides engaging opposite plates for { HEAD ~ bearing } and spacing purposes but is also curved arcuately to conform to { TAIL ~ the circular curvature } of the race
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH