Attaching a grab rail to a fully tiled STUD wall in my shower. Didn't need any rails when the bathroom was converted to a shower room ten-odd years ago .... I'm now 77 with chronic lung dicease. The double-sized shower is enclosed with glass. Tried vacuum-type rails - they don't work and are dangerous .... also tried glueing one of these to the wall. Fell off. So, at the moment I cannot use the shower ...... HELP!!!!!!