The range of movement thus being represented by {HEAD ~ the spacing} between {TAIL ~ the top} of the collar 68 and the bottom of the eyebolt 54 
The range of movement thus being represented by { HEAD ~ the spacing } between { TAIL ~ the top } of the collar 68 and the bottom of the eyebolt 54
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH