This might be a stupid / meaningless question. I just got a Smith Victor - UM-4 Umbrella Light Mount. My question is which side goes up? Here is how I have it mounted. I have the side with the umbrella shaft hole on top. In my mind this allows me to angle the complete umbrella the vertical direction I want. The problem is the flash (sb-600) doesn't appear to point into the center of the umbrella. The other option: Mount so that the umbrella hole under the swivel. Now the umbrella slightly angles up. I can use the large swivel to point the flash directly into the center of the umbrella. I can move the light stand up and down but don't have the flexibility of angling the umbrella. It probably doesn't matter - but I am anal.