Hi folks, I need to make a sync cord that's at least 100 feet long. Does anyone know how to go about doing this? Where I can buy the ends I need, etc? Also, are there any products that allow me to plug in, say, 5 sync cords into a box and then in turn plug one into my camera to trigger all five? I have a friend who is an electrical engineer. Would it be possible to have him make me something? Again, anyone know where I can find applicable parts? Thanks!