forming a plurality of {HEAD ~ protrusions} on {TAIL ~ the periphery} of a polycrystalline superalloy disk, said protrusions being shaped to conform to the blade cavities 
forming a plurality of { HEAD ~ protrusions } on { TAIL ~ the periphery } of a polycrystalline superalloy disk , said protrusions being shaped to conform to the blade cavities
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH