Thread: Terminator helmet hack?

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There's a Terminator Salvation helmet with sound effects and a (poor) voice changer. You can find them for <$20 each if you look around on the net. Has anyone hacked one to use as part of a prop? If so, any hints on how easy/hard, do's and don'ts, etc. would be appreciated.

Those sure look pretty cool but I have seen anybody hack one.