Here is is atop a light stand. The good news is this works perfect for me. The bad news is that this swivel was only available for a while from an individual here in Germany. I don't even know how I'd get a 2nd. It's very strong. I removed the built in hotshoe, drilled the holes larger, made a 3mm thick aluminum plate with matching screw holes, and sandwhiched a normal plumbers clamp between the aluminum plate and umbrellla swivel, then tightened the screws to hold it. Next I made the PVC loop, it's thin at the front, thick at the back, to counter the taper of the back of the quadra head. I lightly sanded the smooth plastic of the quadra head, applied UHU plast (german glue for plastic) and let the pvc adhere to the quadra head. Now the clamp has a flat surface to grip instead of the taper that it slid off before. I also had to make it triple thick where the actual clamp would hit, to make it even with the lip of the quadra head. I then dremeled a slot into the umbrella swivel and tab to let the clamp through, and tightened securely.
Here we go:
[IMAGE TOO SMALL, NOT RENDERED INLINE]
After this photo I dremeled off the excess tab and the build in umbrella holder. You can see the metal swivel holds the umbrella nice and securely, and because of the PVC wedge, it holds it in correct alignment to the flash. The bottom image shows my custom pvc cap that I built. The adaptor, cap, and standard reflector all still fit perfectly.