{HEAD ~ a continuous circular V shaped race} formed in {TAIL ~ one metal plate} to extend concentrically about said common axis and radially spaced a substantial distance therefrom, and 
formed in
{ HEAD ~ a continuous circular V shaped race } formed in { TAIL ~ one metal plate } to extend concentrically about said common axis and radially spaced a substantial distance therefrom , and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH