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January 26, 2015 at 3:52 pm
#58229
The holes are there to support the end of a tapered ring mandrel. A ring after being rough formed (usually with pliers) and silver soldered is out of round. To make it round it is put on a tapered mandrel and tapped into shape with a hammer. The mandrel can either be held in one hand and hammered or supported on one end in the bench hole.
david