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