From Grimorium Verum, Plangiere edition:
To Nail (an Enemy)
Go to a cemetery, remove a nail from an old coffin, saying:
Nails, I take you, so that you may serve to turn aside and cause evil to all persons whom I will.
In the Name of the Father, and of the Son, and of the Holy Spirit. Amen..
When you wish to use it, you must look for a footprint and making the three figures of GULAND, SURGAT and MORAIL, fix the nail in the middle saying:
Pater noster upto in terra [our father who art on earth]
Hit the nail with a stone, saying:
Curse evil to N . . ., until I remove thee.
Re-cover the place with a little dust, and remember it well, because one cannot remove the evil which this causes, but by removing the nail, and saying:
I remove thee, so that the evil which thou has caused to N. . ., shall cease. In the Name of the Father, and of the Son. and the Holy Spirit. Amen.
Then take the nail out, and efface the characters: not with the same hand as you make them, but with the other. Thus it will be without danger.