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