Cameras mounted to flash brackets of any brand tend to twist or rotate on the camera mounting screw. Cork or rubber friction pads help, but the real solution is to use a camera-specific Anti-Twist (AT) Plate. It acts as an interface between the camera and bracket, pin-register to the bracket and conforms to the camera's baseplate. This locks the camera to the bracket to prevent twisting. Because there are so many camera configurations, AT Plates are sold separately. Also, because this Anti-Twist Plates is interchangeable, your bracket will never become obsolete when you buy different equipment.