The apparatus 1, wherein {HEAD ~ the top end} of {TAIL ~ said mandrel} further comprises a fishing neck 
The apparatus 1 , wherein { HEAD ~ the top end } of { TAIL ~ said mandrel } further comprises a fishing neck
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH