The central through hole 311 communicates with a seamless die cavity 33 in the body 30 of the inner die 3, {HEAD ~ a neck} 32 is formed between {TAIL ~ the stop portion} 31 and the body 30 
The central through hole 311 communicates with a seamless die cavity 33 in the body 30 of the inner die 3 , { HEAD ~ a neck } 32 is formed between { TAIL ~ the stop portion } 31 and the body 30
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH