Anti-twist plate for Battery Grip
 

Well one solution always seems to create a new problem. I've been using the A7s on a 'shooter' type rig and with an anti-twist plate (actually for the 5D but works with the A7s) the camera has been rock solid.

Now I've bought the battery grip of course the bloody thing has a rounded base rendering my anti-twist plate pretty useless - now every 5 minutes I find myself having to re-tighten the tripod plate screw - why do stills cameras have no anti-rotation pin hole

Any solutions?