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