To dismantle the corners, you have to take out the slate plate. Under the markings at the top of the rails are the screws for the frame of the rails. Lift off the entire frame and then remove the slate plate. The slate plate of the 7 foot table weighs about 300 pounds. Then you get to the screws from the corners to dismantle them. Each corner is fixed with four nuts. Although the corners were made of thick sheet metal, these are unfortunately very often dented. This basically happens during transport, if you are not careful. I always bend them carefully and if necessary I have them new chrome-plated. However, the original chrome was of good quality and sometimes you can save the old chrome.
Regards, Valero