you have to buy the table, have it broken down. You may find out at that point that the slate could be cracked.
I would make it a condition of the purchase that the slate is not broken.
Then you have to have your table transported to your house. You will have to purchase new cloth and have the table set you. You may also have to buy new cushions if they are bad. Then the mechanic has to do his magic.
It could cost you as much to get the table right as it may initially cost to purchase it.
You may not care if the table is perfect or not. If not, then you could get by with less cost.
Good luck. I would buy a new Diamond if I was you. Perfect and it will last a lifetime and if you amortize the cost over 5 or ten years, it is very reasonable.
--Jeff