A spear and studs are mounted on the platform and {HEAD ~ a hydraulic cylinder} connected to {TAIL ~ the center point} controls the angular orientation of the spear and the frame 
A spear and studs are mounted on the platform and { HEAD ~ a hydraulic cylinder } connected to { TAIL ~ the center point } controls the angular orientation of the spear and the frame
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 OTH OTH OTH OTH OTH OTH OTH