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