A pivot has {HEAD ~ identical first and second members} partially engaged in each other and mobile in rotation relative to each other about a common axis, against {TAIL ~ the action} of at least two return leaf springs each having first and second ends anchored in the first and second parts, respectively, by being wedged inside them 
A pivot has { HEAD ~ identical first and second members } partially engaged in each other and mobile in rotation relative to each other about a common axis , against { TAIL ~ the action } of at least two return leaf springs each having first and second ends anchored in the first and second parts , respectively , by being wedged inside them
OTH OTH OTH HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL 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