From my experience firmly anchoring this kind of furniture on plasterboard is not easy. First many fitments have anchorage holes very close together, quite impossible to achieve in plasterboard - so pick the right kind. Even then something as sturdy as a grab bar needs reliable fixing and I would suggest mounting it on a substantial wooden base that is first secured to the wall Drilling into tile is not difficult, use a piece of masking tape to reduce the masonry drill slipping and do not press too hard, just sufficient to cut. Whatever screw/anchor you decide on it must not put any significant pressure on the tile, or it will crack, I cut the tile hole slightly larger than the mounting hole or this reason. To use toggles requires a very large hole
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20 years ago