Please excuse my ignorance but what the hell kinda contraption is THAT ?
I think like you.It’s gotta be so it follows you around and stays parallel to the rope coming off. Most mounted bollard type devices use pigtails, open hooks, or just rods through the drum to fair lead or keep wraps from yanking off of it, because we stand perpendicular to the device. If it didn’t have the hinge it’d only keep the wraps if we stayed to one side of it.
I wish I could explain it better. The plate with the little bollards, when using it you’d be looking at the side edge of it whether you’re standing 90 degrees to the mounting or 45 or 135 degrees. If it swings far enough anyways.