The other extremity of crank arm 6 is connected to {HEAD ~ an articulated joint} located in {TAIL ~ the rear section} of blade 2 
located in
The other extremity of crank arm 6 is connected to { HEAD ~ an articulated joint } located in { TAIL ~ the rear section } of blade 2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH