Drilling drainage holes

Seattle, WA

I have drilled lots of drain holes in pots, mostly successfully. The hard ceramic ones are not so easy, though, even with a bit labeled for use on glass and tile. Don't want to invest too heavily in new tools. I have just an ordinary electric drill. Which bit will work on my lovely new Chinese pots? Special techniques to avoid cracks? I know about water to cool things down, as well as taking breaks for the sake of the drill itself. Do you place tape around the intended holes? Does it matter which kind?

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