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