It's hard to get wood plugs to fit snugly into the holes you drill for them. Also, when boring holes for tapered candles, a standard spade bit will not produce a snug fit. The holes will be either too large at the bottom or too small for the base to be inserted properly.

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Grind a slight taper on the cutting edges of some spade bits. With these tapered bits, plugs will fit into their holes like a cork into a bottle. Just a few strokes of the file or a pass or two over the grinder will suffice. Make sure both sides have identical tapers. For candles, modify a spade bit of the appropriate size—1516 " matches standard tapered candles. Scribe lines on the bit so it tapers from a 1516 " diameter to 34 " as shown above.
John Wolf, St. Joseph, Mich.