The hub 8 includes {HEAD ~ a flange} 25 at {TAIL ~ one end} engageable with an outer face 26 of the first hub collar 22 and has an outer male threaded portion 27 at its distal end 
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The hub 8 includes { HEAD ~ a flange } 25 at { TAIL ~ one end } engageable with an outer face 26 of the first hub collar 22 and has an outer male threaded portion 27 at its distal end
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL 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