{HEAD ~ helical springs} supported between said ring and {TAIL ~ said blades} retained by said first retaining means supporting said retaining ring, 
supported between
{ HEAD ~ helical springs } supported between said ring and { TAIL ~ said blades } retained by said first retaining means supporting said retaining ring ,
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH