{TAIL ~ The blades} are fabricated with a root portion having a cavity adapted to mate with {HEAD ~ the disk protrusions} 
{ TAIL ~ The blades } are fabricated with a root portion having a cavity adapted to mate with { HEAD ~ the disk protrusions }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD