Several folks were discussing tripods, heads, etc. For many years I used Manfrotto heads and the RC-2 and RC-3 clamps and plates. However, the difficulty I had was the two were not interchangeable. And the "L" plate for a camera body was not efficient. Thus, i made a decision to switch to the Arca Swiss style clamps while adding the appropriate "L" plate to the camera. All turned out fairly well. One of the heads was a new SIRUI which I rotated the clamp by 90° as originally supplied the tilt was right to left and I wanted fore and aft. Here are the conversions, and one can see the various connection methods used for the heads.