The sleeve extension 151 has {HEAD ~ an external diameter D3} as measured to exterior surface 153 which is different from the external diameter D1 of primary inner shell 30′ and different from {TAIL ~ the internal diameter} D2 of the secondary inner shell 40 
The sleeve extension 151 has { HEAD ~ an external diameter D3 } as measured to exterior surface 153 which is different from the external diameter D1 of primary inner shell 30′ and different from { TAIL ~ the internal diameter } D2 of the secondary inner shell 40
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH