I wanted to install this new ball head on a monopod, alas, no reducer screw supplied, it was necessary that I remember that I had one more on top of the same mark on a tripod, so I crate my picture tools. If I had not had that little detail, I had another worry, the plate comes with is not at first sight, compatible with the other ball I own, simply remove two small screws lying below so that the problem is resolved. Having two balls with two plates allows not having to disassemble the plate for navigating the device to the purpose for lesquel I just chose the same brand for both kneecaps to benefit from this quick attach whatever the device used. Two small details that are unpleasant to see unpacking, there is no indication in the description.