Sorry in advance for the blurred photo. I really need to get a new phone.
Don't you love things which are as efficient as they are simple? This is a Lewis pin in action.
You drill a one inch hole into the top of the piece of stone, plug in a two piece Lewis pin and simply lift the heavy block from the top. The pin depends on the weight of the stone to become more efficient. The one inch diameter pin is split into two down the middle, and as the block is lifted the the two pieces are pulled in opposite directions by the rings on the ends, joined together at the top by a single ring through which you put the hook of the lifting gear.
Using this bit of kit gives me so much pleasure.