Is it possible to create an opposite hand mirror of a body?

I have a part that has a helical cut in it, with holes at certain locations in the helical groove.  I'd like to mirror the body, but can't do a normal mirror due to the orientation of the helix (http://i.imgur.com/keRpH.jpg)

I know you can do an opposite hand mirror of a component in an assembly, but can't figure out if this is possible in a part.

To be more clear, this is what I want it to look like: http://imgur.com/TSKwy

I did this mirroring in an assembly, but I would like to mirror it as a part and merge the results.  I'm not sure if the opposite hand mirroring is possible as a part.