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The ends of the wire must butt cleanly to seal each cylinder. Some builders prefer to cut the ends of the wire at a 45-degree angle creating a mitered edge so that the wire ends partially overlap when installed to seal each cylinder. Jim says, "That's great if you're Warren Johnson but filing the ends flat so that they fit tightly against each other is easier and will work just fine for this application." Here, Jim files the first wire end flat on a sharpening stone after it's cut.