the original stump of my anvil was too big in diameter. uncomfortable to move and above all it did not allow me to be as near to the anvil as I like except by placing the anvil itself on the edge of it rather than in the center. so I decided to put it aside for now and use the old stump of my "ASO". I took two pieces of pallet frame and cut them copying the shape of the base of the anvil obtaining two stop blocks which I nailed to the center of the new stump. now I can move it more easily and can get closer to the anvil when I forge. it is perfectly stable and the anvil cannot move at all.
if you are interested here is the link to the video:
https://youtu.be/NHkdosG3-ZQ