The sleeve extension 151 has {TAIL ~ 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 the internal diameter D2 of {HEAD ~ the secondary inner shell} 40 
The sleeve extension 151 has { TAIL ~ 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 the internal diameter D2 of { HEAD ~ the secondary inner shell } 40
OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH