 The team made two minor changes to the design : they removed Davros ' microphone and completely redesigned Davros ' headpiece . The team felt that the microphone was redundant because Davros did not " speak in a whisper and need something to make him more audible " , and originally intended to leave Bleach 's voice unaltered in post @-@ production : the decision to treat the voice was not made until late May 2008 ; and Gorton thought the original headpiece " always seemed particularly weak " for " such a powerful character " . After he was informed that the production designer for Genesis of the Daleks wanted the headpiece to resemble a medical brace , Gorton redesigned it to appear to be " screwed directly into [ Davros ' ] head " . 
