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if you see this youtube videos that are shot in barbershops over in istambul,turky etc...the barbers tense their hands also locking their elbows and do sharp movements just with their wrists...

Thanks jimbo...i always found myself using the wrist as well, specially when using 5/8ths wich is normally my choice, but when going 7/8ths or higer i see myself doing a movement with the whole...