{HEAD ~ a driving shaft} extending through said vessel and inside {TAIL ~ said portion} of the sleeve element, 
extending inside
{ HEAD ~ a driving shaft } extending through said vessel and inside { TAIL ~ said portion } of the sleeve element ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH