a screw feed mechanism housed in a second housing with a second housing opening, wherein the second housing supports a thrust force acting on a thrust receiving flange provided to a male thread member of the screw feed mechanism and {HEAD ~ the first housing opening} is connected to {TAIL ~ the second housing opening} in an axial direction; and 
is connected to
a screw feed mechanism housed in a second housing with a second housing opening , wherein the second housing supports a thrust force acting on a thrust receiving flange provided to a male thread member of the screw feed mechanism and { HEAD ~ the first housing opening } is connected to { TAIL ~ the second housing opening } in an axial direction ; and
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH