how do you remove the original plate from the tripod? I removed the 2 screws but the head does not appear to move.
This plate does not go on the tripod directly. It goes on the bottom of the camera. You get extra plates so that you can use the tripod with two or more cameras quickly without having to switch this plate from camera to camera. The rails on the bottom of this plate slip into the dovetail on the head of the tripod.