Absent an obstacle opposing it, {HEAD ~ stirrup} 216 is urged by spring 22 toward {TAIL ~ its neutral position} at which upper surfaces 269 of notches 268 present rear convex edge 273 to bar 266 at the plumb of rear section of the surfaces forming ramp 265 of brackets 259 as shown in FIG 6 
Absent an obstacle opposing it , { HEAD ~ stirrup } 216 is urged by spring 22 toward { TAIL ~ its neutral position } at which upper surfaces 269 of notches 268 present rear convex edge 273 to bar 266 at the plumb of rear section of the surfaces forming ramp 265 of brackets 259 as shown in FIG 6
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH