Hi Guy, Your best bet is to score the point where you have to drill with a hammer and nail, hitting it just enough to gouge an indentation, and possibly remove some of the glaze off the tile to reduce sliding of the drill bit.
I would also suggest you use a good quality bit, if you have the wherewithal, get yourself a diamond drill bit, that will make mince meat out of that porcelain tile, you'll find it goes much smoother. Oh, and I don't think I need to remind you not to use a hammer drill for this, and if you need to, make sure you turn off the hammer function. Smile. Victor Co-moderator Blind Movie Buffs List Guidedogs List
