After {HEAD ~ stopper} has been brought into position with its teeth 27 and 28 around surface 31 nut 30 is tightened {TAIL ~ such that stopper} 26 and hollow closed end needle 10 are fixedly connected 
After { HEAD ~ stopper } has been brought into position with its teeth 27 and 28 around surface 31 nut 30 is tightened { TAIL ~ such that stopper } 26 and hollow closed end needle 10 are fixedly connected
OTH HEAD HEAD HEAD HEAD HEAD 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