Dick Arentz turned me on to this device called a Cine 60 QR plate. It is used in the television and movie industry to quickly mount VERY heavy movie and video cameras. It is bombproof. You can turn a 12x20 on its side for vertical for instance. They are sort of an esoteric type item, but occasionally pop up on ebay, which is where I found mine. The actual company is in Los Angeles. You might be able to google for their name and address.