{HEAD ~ The tightening system} comprises a central, cylindrical part crossing {TAIL ~ the three retaining elements} through 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 
{ HEAD ~ The tightening system } comprises a central , cylindrical part crossing { TAIL ~ the three retaining elements } through 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
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