He likely cleaned up the sockets that were on the existing bowl and reattached them with bolts, washers, and nuts. He could have also found a donor kettle to do this.
It is a fairly common repair for vintage kettles and is the preferred method. Some have tried to do weld repairs, but usually the kettle has to be in exeptionally bad shape. Plus you need a welder who is precise or the heat will actually cause more porcelain loss.
Are there replacement leg sockets?
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