Changing the rotation point of a static mesh in a blueprint

Hi, im trying to animate a static mesh so it rotates but I cant seem to change the point of rotation. Ive tried to alt and middle mouse click and move it in the blueprint but that moves the static mesh too. Can anyone tell me a way to do this please

I think Unreal 4.16 will have this ability - for now I think you have to either re-center it in a 3d editor tool, or you can maybe get away with sticking your mesh inside of an actor and centering it within a scene of that actor, then rotate the parent actor