Complex rigid body has parts facing up and facing down, how do I flip direction individually?

[Blomen]

I've got a rigid surface composed of multiple individual surfaces.
These surfaces are either "facing up" or "facing down"... how do I make them all "face the same direction"?

*Flipping sides just makes all of the individual surfaces switch direction, which doesn't solve my problem.

 

[Blomen]

Nevermind I found the solution.

Transform, Surface, Translate... reverse direction.

 

[Blomen]

Nope... still didn't work...

 

[Blomen]

Edit, Surface, Reverse.

That's it.