On Sun, 08 Jun 2008 11:42:41 +0100, Dave Plowman (News) wrote:

I've not had the confidence to use a centre punch, which does sound a
good idea.

'Tis, it's what I use, or a nail. It just needs a very gently tap to break
the glaze. I sometimes work the tip of the punch (nail) a bit to get a
good start for the drill. Don't bother with a pilot but do use one of
those "universal" drills rather than a standard masonary one.

--
Cheers
Dave.