One side of {TAIL ~ that material} is V shaped to extend into and conform to the V shape of said race sufficiently along the length of the race for centering {HEAD ~ one plate} 
One side of { TAIL ~ that material } is V shaped to extend into and conform to the V shape of said race sufficiently along the length of the race for centering { HEAD ~ one plate }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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 HEAD