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