I've had a couple HP members PM me for more details/pics on how i made this mod.
So here goes:
i dont cover the top holes.
i had to cut around the bottom of the salt shaker top so it would fit under the tin foil. But dont cut too much (you might not have to cut it to size) cause then it will sit on the top of the phunnel, and you dont want that.
Then i cut 6 triangles and dented the top of the shaker just to make sure it would fit under the foil.