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