Not sure what others received in their mail, but this soft release button is amazing and it fits X-T3 like a glove. Maybe they should check item description before placing the order, simply to see which cameras this button's thread is made for. Not all cameras use the same thread and diameter. For X-T3, I can guarantee it fits perfectly. It comes inside small packaging with two o-rings included (one is just reserve). Inside the small manual, it clearly states that O-ring is needed for Fujifilm X series cameras, and that Sony RX1 and RX10 don't need it (little longer thread inside the camera's button). Also, don't think you will not need that O-ring. It's not there just because they said it's needed for Fujifilm X-series cameras. Its main purpose is to act as a spring. Once you tighten your soft release button to the camera's shutter release button, O-ring will compress a bit, and it will push back against the soft release button, holding threads of the soft release button tight and secure inside the shutter release button of the camera. There is simply no play, it stays there once it's properly installed, and it's not moving left or right, unless I wan to unscrew it. Even then it takes some force to do it. Falling of the camera by itself? Nonsense. Some other people mentioned using loctite glue, gorilla glue, crazy glue and whatnot. Who wants to ruin their camera they paid with hard earned money by burning it with those chemicals?! I sure don't. Simply install that O-ring properly, there is even quick tutorial in few pictures on how to do it properly. Even though it might seem non-important, for sure IT IS important to install it properly. Follow those few simple steps they provided on that little paper that came inside the box, and your button will stay there without falling off. I am talking about X-T3, can't confirm for other cameras, X-T3 is the one I have and use this soft release button with. Have a look at the photos I attached, you can see how it fits and looks like when installed. That amazing looking knurling around the soft release button matches the knurling of the X-T3's buttons. It looks amazing! April 23rd update, 17 days later... release button sits as tight as I left it when I mounted it on April 6th. After heavy usage of my camera (in photo and video mode), I can confirm this button stays where you put it. Note: you have to use O-ring provided with the button. It will serve as a spring adding additional resistance against the thread. Amazing product, would purchase again if needed.
