How it connects to start with.
Using the box clip to stretch the elastic and clip tight to the pole.
You can see the difference in this last two by the edge shown on the Deep Umbrella
I have been using a light that is imported by Dynalight, Grand GSB 79. Basically a giant umbrella with a diffuser placed about midway in the design. After working with it awhile, I was getting hard spill where the diffuser does not meet right to the edge of the structure. I searched the manufacturer’s web site and found no solution. For some reason Dynalite or the maker do not bring in to the US a front diffuser that would solve this little issue. I think the details make the difference, so I set out to find a solution and it was easy. Those little box clips you get at Staples or Office Depot were the solution. They are strong enough to hold via the elastic that is on the diffuser to clamp tightly to the pole. (See the second picture). This totally eliminates the spill light that is plagued by the initial design. So a few box clamps and the spill is gone.
As far as a diffuser, I have a 8×8 foot 1/2 silent silk made by the Rag place in LA for my front diffuser. This combination has worked very well. I travel with it in a 62″ Flip Lid from Lightware. I clip on the diffuser with little A clamps purchased at Home Depot.