A cover plate encloses {HEAD ~ the internal chamber} housing the inertia disc, and the internal chamber is filled with {TAIL ~ elastomeric urethane} 
A cover plate encloses { HEAD ~ the internal chamber } housing the inertia disc , and the internal chamber is filled with { TAIL ~ elastomeric urethane }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL