A helical spring is received in, and actually extends into, a blind hole in each stem, and {HEAD ~ the inner end} of the spring rests on {TAIL ~ the retaining ring} at the projection urging the blades outward 
rests on
A helical spring is received in , and actually extends into , a blind hole in each stem , and { HEAD ~ the inner end } of the spring rests on { TAIL ~ the retaining ring } at the projection urging the blades outward
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH