Duplicate the original side of the head and scale this in the - or + X by 1 (-1 or 1) and this will allow the head to be positioned correctly. Also make sure the axis is set to the origin 0,0,0 before duplicating.
To be able to set the Origin select the object and press Insert, then use the move tools whislt holding X to snap it into position. Then press insert to go back to the standard tool...
Chris (formerly R@nSiD)
Twitter
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)