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