Anthony slid the book over to Padma. "The hardest part seems to be the lack of access to the master coin, which I'm sure Hermione still has. If you flip to the next page, however, it does show you how to reassign a new master. We can use the coins again, if we wish, or we can put the charm on a whole new object. I'm weighing the pros and cons between simply modifying the existing charm or starting from scratch."
He contemplated the situation for a few moments. "I still think it might be easiest just to reassign a new master coin. In which case, our best bet would be to use Neville's."