Fujinon's MCA-06BC Pan Handle Mounting Clamp for Select Fujinon Digital Demand Units is a split-style clamp that attaches to your tripod handle and allows you to mount an optional Fujinon ERD-10A-D01M digital zoom demand or optional Fujinon EPD-4A-E12A focus demand unit.
The clamp relies on two knobs, one small knob and one large, for thickness adjustment. Both knobs fit into a hinged flap, which allows you to open the clamp, place it on your pan handle and then swing the large knob over the clamp to secure it. The two knob / hinge arrangement allows you to keep the top and bottom of the clamp parallel to each other with different diameter pan handles, for maximum grip while equally distributing the clamping force on your pan handle.