I modeled the wedge that goes into a Manfrotto Super Clamp. If you lost yours or need one with more surface area to clamp onto you can download it here and 3d print it yourself.
https://www.printables.com/model/390777-wedge-for-manfrotto-super-clamp

After years of wanting one. I finally found this one for ¥1100 at a HARD-OFF in Tokyo 😃

Good morning Tokyo