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