Well, if you start with a 3/4" hole, you have an excuse to buy one of these...
Don't bother tapering the hole, the candle can cope with that.
Candleholders really should be lined with a non-charring non-flammable
liner. I make and sell candle sconces, I've done the experiments!
Although you probably couldn't set one on fire by deliberately trying
to, you'll easily get charring if you let the candle burn out. That's
either ugly to look at afterwards, or translates to angry customers
So mine always use a copper cup to receive the candle. You can buy these
from craft shops at great expense, or you can use plumber's end caps for
22mm pipe (cheap, if you buy bagfuls from the right place).
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