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