a pair of {TAIL ~ pulley flanges} defining {HEAD ~ a V space therebetween}, one flange being fixedly positioned and the other being axially movable with respect to the fixedly positioned flange 
a pair of { TAIL ~ pulley flanges } defining { HEAD ~ a V space therebetween } , one flange being fixedly positioned and the other being axially movable with respect to the fixedly positioned flange
OTH OTH OTH 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