In a preferred embodiment of {HEAD ~ the invention}, the mold cavity 404 is formed by a bottom mold 406, {TAIL ~ a bottom riser block} 408, and a cull block 410 
In a preferred embodiment of { HEAD ~ the invention } , the mold cavity 404 is formed by a bottom mold 406 , { TAIL ~ a bottom riser block } 408 , and a cull block 410
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH