Cosmos - deadheading

How do I dead head my cosmos? Do I use scissors to cut the stem from the main plant or clip off the actual flower head?
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I just popped off the flowers by hand. Sometimes the stem separatd from the main one. It keeps flowering nicely.
DiGiTAL ViNYL (no email) Zone 6b/7, Westchester Co, NY, <1 mile off L.I.Sound 3rd year gardener http://pg.photos.yahoo.com/ph/royalfrazier/album?.dir=/2055&.src=ph
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