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Note the speedring used, it's very easy to attach them to any swivel bracket and use a hot shoe flash on them. The attaching portion has four fairly large threaded tightening bolts and you can use those holes.
I used one long bolt to replace the existing one in the ring, and put the bolt through one of two holes drilled in a metal plate. The metal plate links the swivel bracket to the speedring, and I used a stud that fit the threads for the swivel bracket's little brass adapter and top aluminum hot shoe flash mount, and inserted the stud through the second hole in the metal plate, and tightened the flash mount and brass adapter on either side of the plate. Tools necessary were drill, stud (cut bolt in my case), bolt, one nut, existing swivel bracket and accessories, about 1" of spacers for the speedring-side bolt, and a flat piece of steel to drill holes in.
The softboxes are okay quality, everything is either metal or fabric. Similar hot spot as seen before in the center, even with the inner baffle inserted, due to the beam's so-so dispersion from a hot shoe flash inside the softbox.