In article , Charlie wrote:

On Mon, 21 Apr 2008 10:46:54 -0700, Billy wrote:

I'll add to what the others suggested about drilling. If the bottom is
concave at all, back it up with a block of wood so that the bottom is
resting solidly where you will drill. Slow and easy and even easier
when it begins to go thru.

Charlie

Thanks for all the advice, I'm off to get a concrete drill, although
Jangchub's suggestion of lotus slowed me down a bit, but I don't think I
have the heat or the sunlight for it.

Thanls again.
--

Billy

http://au.youtube.com/watch?v=7WBB0s...eature=related