Technical Support wrote:
We do not offer an alternative method of attaching soft boxes as the integrated system is tested with our boxes and performs well (there will always be exceptions on a case by case basis). You may see a small gap (1/8" or less), however, this will affect neither the light being cast or the ability of the light to securely retain the softbox.
Sorry I've been shooting like crazy, this is still a problem for me. I'm new to using strobes, having a great time with them but I shoot in more extreme [not that extreme] situation than in a studio and generally around expensive objects so I need the attachment between the softbox and the stand to be rock solid.
Are speed rings standardized so I can purchase some kind of stand attachment?