I don't know the name of the trick, but I learned it from this video by Spin Queen... (0.57)
[youtube]http://www.youtube.com/watch?v=hZQ7Lpvmf54[/youtube]
I find it easiest on, of all things, a P213.
Gerardo does a three-way-whatever-it-is in this video (first trick)
[youtube]http://www.youtube.com/watch?v=k7eyYEFJP54[/youtube]