Otherwise {HEAD ~ a wedge} shaped {TAIL ~ metal corner bracket} with an aperture therein to pass a bolt through is attached to each frame corner 
shaped
Otherwise { HEAD ~ a wedge } shaped { TAIL ~ metal corner bracket } with an aperture therein to pass a bolt through is attached to each frame corner
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH