When the hook engages {HEAD ~ an object} and the body is lifted by the lifting device, the body rotates and the guide rotates about {TAIL ~ the hinge} so that the guide continues to extend vertically 
When the hook engages { HEAD ~ an object } and the body is lifted by the lifting device , the body rotates and the guide rotates about { TAIL ~ the hinge } so that the guide continues to extend vertically
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH