The tightening system comprises a central, cylindrical part crossing {TAIL ~ the three retaining elements} through {HEAD ~ mutually flush clearances} and furthermore two external washers enclosing between them the two lateral retaining elements, the inside surfaces of washers each resting against the associated lateral retaining element 
The tightening system comprises a central , cylindrical part crossing { TAIL ~ the three retaining elements } through { HEAD ~ mutually flush clearances } and furthermore two external washers enclosing between them the two lateral retaining elements , the inside surfaces of washers each resting against the associated lateral retaining element
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD 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