The DM-Accessories Pivoting Back Plate Upgrade for EX3-SHLD provides a swinging plate for third-party battery mount plates. Designed for the Anton/Bauer Gold Mount, V-lock plate, most wireless drop boxes, it includes several 1/4"-20 standard holes for other accessories. The pivoting allows the battery's weight to swing back for use as a counterbalance.
The pivoting back plate mounts up to 2 BP-U battery plates like the BP-U30 and BP-U60. It can also mount 2 Dolgin plates or an upcoming dual-BP-U plate from DM-Accessories and is compatible with the Nano Flash.