I have monopod N-1004 ordered this ball head to my Sirui Three / to and am very happy with it. My SLR with heavy lens keeps the ball head bombproof in any position. Through the safety pin, the camera can not slip off the head even when dissolved screw. I almost always let the removable disk to the camera, so that the assembly has happened on the tripod head in a matter of seconds. The ball head can be adjusted smoothly. You can adjust how easily the ball head can be moved so that it is no problem to put the camera in the desired position relatively quickly. I highly recommend this part definitely.