Assuming you have a standard type bar box - Unbolt the rails from the side of the table. Lift the slate up and stick a 2X4 under each end so the slate rests on top of the table. Go to home depot and get a can of 3M Super 77 and glue the cloth to the edges of the slate. Get someone that knows what they're doing to help you.
I'm just wondering if we should charge for help posts since some of the "Clique" have this thing about freeloader ads. LOL - Never ceases to amaze me what I read in the main area.