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