Change the text of the rule “Hammers” to read:

Each Monkey has exactly one Hammer, the type of which is tracked in the GNDT. All new Monkeys have Fairy-type Hammers.  As a weekly action a Monkey may change their hammer to any of the hammers listed below.

At the end of the rule “Doing the Dance” add the text:

*The monkey in position n_A uses their hammer on the monkey in position n_B

Create a sub-rule of “Hammers” “Fairy-type” with the text:

If a Fairy-type hammer is used on another monkey, and that monkey has an odd number “Dance Moves” that monkey’s Dance Moves are increased by 1, if that monkey has an even number of “Dance Moves” that monkey’s dance moves are decreased by 1.

Create a sub-rule of “Hammers” “Banana-Hammer” with the text:

If a Banana-Hammer is used on another monkey, that monkey’s banana’s are reduced by 1 to a minimum of 0 bananas.