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