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