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Yes the pipes go left & right quite easily if that makes any difference to determining which way the pipes go?Most likely the pipes come vertical up or down (I’m guessing that’s a stud wall as the pipes seem to have a lot of play)
You can sometimes tell by careful wiggling and listening believe it or not.
In which case rotate the fixing plates so that the screws are horizontal.
In any case, drill the fixing hole slowly and with only a little pressure, once you’re through the tile continue slowly and watch the pipe - if it moves as the drill advances -STOP.
If you’re going slowly and carefully you will not pierce the pipe and then rotate the fixing plate and try again...
Sorry what do you mean cut off the outer rim of the plug?I’d use red uno plugs, push them 90% through the tile or they’ll crack - you’ll have to carefully cut off the outer rim of the plug.
As a back up, put a bit of silicone or stixall on the back of the brass plate just before you fix it.
Oh do you mean the lip edge of the plug on the end where you insert the screw? As I have some uno plugs & they don't have that on them. I was going to drill using a 5.5mm bit so it's a tight fit, would that be ok or should I go bigger as I will need to push the plug through. And with the screws I was going to use the standard 8 size but if I am pushing the rawl plug through would they be enough to go through? Sorry for all the questions just want to make sure I do it properly once & be done with it.The flange at the top, you need to trim it to a smaller diameter with a Stanley knife, so that you can push it through the tile.
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