{HEAD ~ The annular space} between the internal lateral wall of the cone frustrum allows {TAIL ~ a relative lateral displacement} and of at least one damping ring secured or not secured to the internal lateral wall of the circular cap and the lateral wall of the cone frustrum 
allows
{ HEAD ~ The annular space } between the internal lateral wall of the cone frustrum allows { TAIL ~ a relative lateral displacement } and of at least one damping ring secured or not secured to the internal lateral wall of the circular cap and the lateral wall of the cone frustrum
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL 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