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