I have 2 flashes. One 430EX and one Sunpak 383. I would like to make each of these clampable. I see a "Bogen Super Clamp 2900 with Standard Stud" at bhphoto. Will I only need one of these to hold a flash? Strobist.blogspot's lighting101 looks like it has something else attached to it. What is that attachment, and what does it do? So, i suppose what I am asking is.... to clamp my flash to a table/door/object/etc, what do I need?