Making one is rather simple. The tables I have in my shop are 1 1/2" thick. I drilled out 2, 3/4" hole in the edge, about 2 1/2" deep, and put a 3/4" dowel 6"-8" long in each hole. These are 18"-20" apart. I then took a small piece of bike inner tube and slipped over the dowel, cushion for the bow, when the bow is on the dowels, I wrap it with a piece of Velcro, or bungee to secure it to the dowels. For those who do not wish or have a table to drill into the edges, a 2" X 4"or 6" clamped to the table will work. I will try to get a picture posted today.
Thanks,