The holesaw is definitely the way to go if you can, but just in case you can't borrow one, alternatively, you could go with a jigsaw - again, mask it off as Malatory said, but slightly undercut it...
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The holesaw is definitely the way to go if you can, but just in case you can't borrow one, alternatively, you could go with a jigsaw - again, mask it off as Malatory said, but slightly undercut it...