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The hole can be bored out with an expansive bit, or sawed out with a scroll saw, and filed perfectly round with a half-round wood file.

Holes up to 3 in. in diameter can be cut quickly and accurately with an ordinary expansive bit.

Punch a hole, with a nail set or punch, in the center of the circle to be cut, large enough to receive the spur of the expansive bit.

With an expansive bit bore a hole 3 in. in diameter through the block.