{HEAD ~ an annular retaining ring} disposed inside said hub and located closely adjacent {TAIL ~ the inner end} of the stems and generally concentric thereto, 
located closely adjacent
{ HEAD ~ an annular retaining ring } disposed inside said hub and located closely adjacent { TAIL ~ the inner end } of the stems and generally concentric thereto ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH