In the preferred embodiment, the first pivot mount 40 is formed with {HEAD ~ a pair} of {TAIL ~ side walls} 47, 38 and a back wall 39 rigidly secured to and extending between walls 47 and 38 
of
In the preferred embodiment , the first pivot mount 40 is formed with { HEAD ~ a pair } of { TAIL ~ side walls } 47 , 38 and a back wall 39 rigidly secured to and extending between walls 47 and 38
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH