VANGUARD VEO+ MA1 - MULTI-MOUNT ADAPTER FOR TRIPOD
The MA1 adapter slides over the tripod's central column to mount additional equipment when the column is in a horizontal position. From a second camera, a microphone, a flash, a spotlight, an external monitor, or whatever you prefer.
"The Veo MA1 adapter is designed to equip the central column of the Veo 3+ tripod with a second piece of equipment. When the central column is positioned horizontally, the Multi-Mount adapter can be mounted on the tube in order to hold an additional camera, monitor, telescope, etc.
The Veo MA1 adapter comes included with the Veo 3+ tripod, whose multi-angle column is marked with easy scales so that photographers can establish a precise position along the smooth surface."