Hereby is formed {HEAD ~ a circular opening} 26 in {TAIL ~ the wall} 25 through which the shaft 16 extends up to the plane rear wall 27 
in
Hereby is formed { HEAD ~ a circular opening } 26 in { TAIL ~ the wall } 25 through which the shaft 16 extends up to the plane rear wall 27
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH