My first thought is, why? Those are expensive sticks. I'd re-think it for a while before actually doing it.
If you STILL want to do it, I'd use a Dremel and carefully cut and make the hole bigger slowly. The lip of the button should cover any imperfections. Just go SLOW. But before you cut, make sure the button you put in has room inside to fit. Again, do this BEFORE you cut anything.
Good Luck.
D