Preferably, said stirrup includes a pair of spaced arms, each arm having {HEAD ~ one end} pivotal about {TAIL ~ said pivot axis}, and a transverse bar interconnecting the respective other ends of said arms 
pivotal about
Preferably , said stirrup includes a pair of spaced arms , each arm having { HEAD ~ one end } pivotal about { TAIL ~ said pivot axis } , and a transverse bar interconnecting the respective other ends of said arms
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH