This is a new zoom tripod mounting ring. It has a longer profile foot and looks yo be a little stouter in design. I haven't as yet found one but when I do I plan to secure one and I will be able to tell you more about it. As is right now I have a arca style plate on one ring and a wooden handle on the other. The handle is a great aid for long days. I use it on my macro lens all the time instead of fighting a tripod. Shooting florals from a tripod is fine but when a Bee is in gathering mode, he doesn't much care if you have your tripod setup or not.
If any one sees the TS-41 offered at a vendor please give me a shout. Thanks