Here’s a little gadget I called the Boomerang - it mounts to the AB plate on the back of your camera, and gives you a lightweight but strong 1/4” mount. It’s made of aluminum, and bored out to reduce the weight. It’s a perfect transmitter mount for the back of the camera.
This is a one-off part I hand-made for this, which I don't use enough to keep in my kit right now. It has some scuffed paint on it, but it works perfectly.
Asking $175 OBO. Email me at email@example.com