The casing defines {HEAD ~ spaced apart internal frustoconical surfaces} positioned to engage corresponding surfaces of {TAIL ~ the segments} in the same axial direction 
The casing defines { HEAD ~ spaced apart internal frustoconical surfaces } positioned to engage corresponding surfaces of { TAIL ~ the segments } in the same axial direction
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH