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