Obviously Musous have the base cup hole and now also the Krom Birthday model and I think there is a Yancy custom with a base cup hole. But does anyone drill their base cups to attain better balance on some of their setups? And If so what sort of hole diameter drill and depth are you going for? I ask as I am sure I'm seeing edits pop up now and again where the kendamas being slayed have some base cup mods going on! Also I have a base heavy setup that I may modify.