a screw feed mechanism housed in a second housing with a second housing opening, wherein {TAIL ~ 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 the second housing opening in an axial direction; and 
a screw feed mechanism housed in a second housing with a second housing opening , wherein { TAIL ~ 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 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 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH