The rearward end of the plug pin 30 is held by {HEAD ~ a pin} mounting 33, onto {TAIL ~ whose rear end} 34 a helical spring 35 is pushed 
The rearward end of the plug pin 30 is held by { HEAD ~ a pin } mounting 33 , onto { TAIL ~ whose rear end } 34 a helical spring 35 is pushed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH