See Ethdoc 223 - Objects selected by T A Joyce This is presumably: '25. Ogun. Iron symbol of revenge, with the peg and the maul. The peg is driven into a board at the same time the curse of revenge is uttered. With further sacrifices and tapping of the maul on the peg, the Ju-Ju may be renewed, more or less from month to month, until it takes effect.'