Rearward adjustment plate segment 10 is joined along {HEAD ~ a forward edge} to the rearward edge of {TAIL ~ forward adjustment plate segment} 12, forming a substantially right angle 
Rearward adjustment plate segment 10 is joined along { HEAD ~ a forward edge } to the rearward edge of { TAIL ~ forward adjustment plate segment } 12 , forming a substantially right angle
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH