How would one mount speedlight to an OCtabox or large softboxes

I use a Morris Softbox Kit that I posted here.
https://photography-on-the.net …hread.php?t=444​190&page=4

It comes with a small softbox, speedring and l bracket.
I would highly recommend the Bogen 2905 adapter as it is heavy duty.

I have been able to put a Medium Photoflex Multidome softbox on the ring that comes with the Morris kit. I would think it would be able to mount the large, however, whether the Speedlite can light it up well enough is another story.

I'm also thinking of using the Morris dual mount shown in the same pic in conjunction with the Bogen 2905 so I can fire two Speedlite's into larger softboxes...

-Mario

Here is another thread I recently started looking for similar solutions.

https://photography-on-the.net/forum/showthre​ad.php?t=518029