The Hardware Horseshoe cock rings work by putting extra pressure on the vein at the top of the penis-- this is why they have the dimple bent in the top of the metal ring. However, they are absurdly overpriced, and complicated to put on (be careful not to pinch yourself). So, although I liked the effect in the demonstration, I didn't buy it. I did make my own, for all of about $5, from material I purchased at the hardware store. While it worked very well, I then realized that a simpler much design would have about the same effect, and be easier to put on and easier to make.
So, I made the ring in the attached picture. This is simple, and just about anyone can do it. It's a strong, thick rubber cockring, made to measure to give just the right pressure, with a 5/8 inch plastic bead threaded over it. I wear it with the bead on top, where it presses in the same place as the dimple in the Hardware Horseshoe ring. But, it is much easier to put on, doesn't look as dorky, is very cheap, and has a superior effect, like the Horseshoe ring.
You might wonder how I got the bead on the ring. For a long time, I've been making custom-sized rubber rings from neoprene rod, which can be purchased from industrial hardware dealers. Using a sharp razor blade, you just cut off the necessary length to make the desired size ring, then glue the ends together with crazy glue to form a ring. Surprisingly, if you cut the ends cleanly, and press the ends firmly together for about a minute while the glue sets, the glued joint is as strong as the rubber itself. To make the beaded ring, I just slipped a big plastic bead from a craft store over the rubber before I glued the ends. (I think I need the bead to be just slightly bigger, so I plan to make a new one soon.)
This particular ring is made from 3/8 inch thick neoprene cord, Shore 30A durometer, obtained from McMaster-Carr (
www.mcmaster.com), stock number 8466K123 (3-foot length, makes a lot of cock rings...).