2x MENGS® Dual Nuts Hot Shoe 1/4 "Screw Adapter for Flash Trigger, Flash, microphone, GPS and Digital Camera (Electronics)
am not a technician, but there are many varieties 'metal' / aluminum; this is the better, harder quality. Otherwise you can not say much about this: 's thread, two locknuts, doing what it should. Thereby mount a second, mini-camera on my 'main camera
