That's it mate, you already know what to do, fire that baby up.OK so pipe goes through nut then fire olive on and tighten?
Use a masonary drill or a diamond bit, keep it cool with water..
http://www.screwfix.com/p/bosch-expert-diamond-tile-drill-bit-6mm/59438
Show us the progress and complete pics
Cheers mate. I'm just being a bit OCD about it as you can tell as it want it to be right.