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...The tilt issue is very easy to fix. ...simply use a second umbrella clamp. Use one umbrella clamp as usual to hold the flash at the end of the umbrella rod, but don't use this clamp to attach it to the light stand. Instead, use a second umbrella farther down the mounting rod (towards the umbrella splines) to attach it to the stand. That will give you total control of the tilt without interfering with the cover while still leaving your flash at the end of the mounting rod. This is the way I plan on solving the "tilt...Show more →
That is pretty much how I did it (see photos below) before I got a boom stand, with the addition of an L bracket to move the flash head closer to the center arm. It works well, but using a boom stand is even easier and has more tilt range. I turn the box "sideways" so that the zippered opening is on the side instead of the bottom, and the boom runs horizontally into it. By rotating the boom arm I then have 360 degrees of "tilt" adjustment, and turning the stand gives me 360 degrees of "pan" adjustment.
Another method is to use another tilt adapter outside the box, and a short length of pipe as a center-column extension to run from this adapter into the box; that way the change of angle happens outside the box. The problem with this method is that large downward tilt angles move the center of gravity of the box forward, resulting in less stability.