Counter-weight

Where can I buy one of those counter weiht dices

You can buy here at the shop:

And this guy is selling clear ones:
http://yoyoexpert.com/forums/index.php/topic,14222.0.html

Drill a hole through a dice.

here at yoyoexpert~

yah, you can buy them here, sometimes you can find them on the bst. I think supernaut might of been selling them. But you can also drill a hole through a die or bouncey ball. I prefer the bouncey balls because they don’t hurt your knuckles so much, but if you just drill a hole through a boucey ball and don’t buy one of the duncan one’s they don’t last that long.