{TAIL ~ The main difference} in relation to the embodiment shown in FIG 1 is the shape of {HEAD ~ the elastic element}, which here is more a disc than a sleeve 
{ TAIL ~ The main difference } in relation to the embodiment shown in FIG 1 is the shape of { HEAD ~ the elastic element } , which here is more a disc than a sleeve
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH