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