Here is an option for mounting the Preston MDR. The MDR mounts on the large part of the plate. There is a 3/8-16 Screw knob for you to quickly mount them to the side of the camera, handle, low mode plate, accessory cube (below) and Etc. The screw knob is captive. The new washer and pins keep the secure the plate to that position. It can be removed if not using on Arri design. Anodized Black. #CP012-1 is for the new smaller MDR-3! Now offered in a right angle version.