As may be noted, in particular from FIG 8, the means 40 are in {HEAD ~ part} hidden via {TAIL ~ the plug} 20 and in part received in the cavity 41 
hidden via
As may be noted , in particular from FIG 8 , the means 40 are in { HEAD ~ part } hidden via { TAIL ~ the plug } 20 and in part received in the cavity 41
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH