Mine are mounted with the flange recessed inside the camera bed, top of the flange flush with the inside surface of the bed, so the tripod screw pulls the socket tighter and there's no danger of the socket getting ripped out of the camera bed. Barry can also make the flange diameter, barrel diameter, overall length, and screw thread to order, which is a considerable convenience. I had mine made so that I wouldn't have to buy any new drill bits, and so the overall length would correspond exactly to the thickness of each camera bed.