Okay, I'm doing a tub surround with porcelain tile. Got the last cut around the fixtures that requires a hole to be cut in the center of the tile. Long story short, I've busted 22 tiles trying. I've tried every single drill bit I've got. Everything from metal hole punchers to concrete bits. Nothing even scratches this porcelain tile. Any tips on how to punch a hole in this tile? I'm desperate!