A movable stirrup on {TAIL ~ the binding member} is resiliently biased to {HEAD ~ a neutral position} 
A movable stirrup on { TAIL ~ the binding member } is resiliently biased to { HEAD ~ a neutral position }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD