{HEAD ~ A pair} of longitudinally extending, symmetrical fingers extends from the distal end of an elongated tubular inner member and are juxtaposed {TAIL ~ adjacent a window} at the distal end of an elongated tubular outer member 
{ HEAD ~ A pair } of longitudinally extending , symmetrical fingers extends from the distal end of an elongated tubular inner member and are juxtaposed { TAIL ~ adjacent a window } at the distal end of an elongated tubular outer member
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH