The body of lead may be fixed relative to {TAIL ~ the outer jacket} and the shaft has {HEAD ~ a portion} of reduced diameter which moves through the lead 
The body of lead may be fixed relative to { TAIL ~ the outer jacket } and the shaft has { HEAD ~ a portion } of reduced diameter which moves through the lead
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH