I'm fixing a s'ingle point' shower head support by the bath on a
tiled, plasterboard stud wall. I thought I had chosen a place with a
stud behind it, but when I drilled through 10mm of tile and then 12mm
of plasterboard I hit air :-( I could kick myself!

Is there anything better than a Molly screw in this situation? I mean
those anchor bolts with legs that expand out behind the
plasterboard. http://img2.timeinc.net/toh/i/a/repair/hanging-05.jpg

Ideally I'd like something that has very long expanding legs so as to
spread the strain tp the biggest area.

any thoughts?

Robert