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